diff --git a/backend/src/main/java/com/storycove/controller/StoryController.java b/backend/src/main/java/com/storycove/controller/StoryController.java
index 1dfc059..272050c 100644
--- a/backend/src/main/java/com/storycove/controller/StoryController.java
+++ b/backend/src/main/java/com/storycove/controller/StoryController.java
@@ -837,7 +837,7 @@ public class StoryController {
             @RequestParam(required = false) String authorName,
             @RequestParam(required = false) UUID seriesId,
             @RequestParam(required = false) String seriesName,
-            @RequestParam(required = false) Integer seriesVolume,
+            @RequestParam(required = false) Double seriesVolume,
             @RequestParam(required = false) List<String> tags,
             @RequestParam(defaultValue = "true") Boolean preserveReadingPosition,
             @RequestParam(defaultValue = "false") Boolean overwriteExisting,
@@ -948,7 +948,7 @@ public class StoryController {
             @RequestParam(required = false) String authorName,
             @RequestParam(required = false) UUID seriesId,
             @RequestParam(required = false) String seriesName,
-            @RequestParam(required = false) Integer seriesVolume,
+            @RequestParam(required = false) Double seriesVolume,
             @RequestParam(required = false) List<String> tags,
             @RequestParam(defaultValue = "true") Boolean createMissingAuthor,
             @RequestParam(defaultValue = "true") Boolean createMissingSeries,
@@ -1082,7 +1082,7 @@ public class StoryController {
         private String description;
         private String contentHtml;
         private String sourceUrl;
-        private Integer volume;
+        private Double volume;
         private UUID authorId;
         private String authorName;
         private UUID seriesId;
@@ -1100,8 +1100,8 @@ public class StoryController {
         public void setContentHtml(String contentHtml) { this.contentHtml = contentHtml; }
         public String getSourceUrl() { return sourceUrl; }
         public void setSourceUrl(String sourceUrl) { this.sourceUrl = sourceUrl; }
-        public Integer getVolume() { return volume; }
-        public void setVolume(Integer volume) { this.volume = volume; }
+        public Double getVolume() { return volume; }
+        public void setVolume(Double volume) { this.volume = volume; }
         public UUID getAuthorId() { return authorId; }
         public void setAuthorId(UUID authorId) { this.authorId = authorId; }
         public String getAuthorName() { return authorName; }
@@ -1120,7 +1120,7 @@ public class StoryController {
         private String description;
         private String contentHtml;
         private String sourceUrl;
-        private Integer volume;
+        private Double volume;
         private UUID authorId;
         private String authorName;
         private UUID seriesId;
@@ -1138,8 +1138,8 @@ public class StoryController {
         public void setContentHtml(String contentHtml) { this.contentHtml = contentHtml; }
         public String getSourceUrl() { return sourceUrl; }
         public void setSourceUrl(String sourceUrl) { this.sourceUrl = sourceUrl; }
-        public Integer getVolume() { return volume; }
-        public void setVolume(Integer volume) { this.volume = volume; }
+        public Double getVolume() { return volume; }
+        public void setVolume(Double volume) { this.volume = volume; }
         public UUID getAuthorId() { return authorId; }
         public void setAuthorId(UUID authorId) { this.authorId = authorId; }
         public String getAuthorName() { return authorName; }
diff --git a/backend/src/main/java/com/storycove/dto/EPUBImportRequest.java b/backend/src/main/java/com/storycove/dto/EPUBImportRequest.java
index 2783c12..a8ca060 100644
--- a/backend/src/main/java/com/storycove/dto/EPUBImportRequest.java
+++ b/backend/src/main/java/com/storycove/dto/EPUBImportRequest.java
@@ -19,7 +19,7 @@ public class EPUBImportRequest {
     
     private String seriesName;
     
-    private Integer seriesVolume;
+    private Double seriesVolume;
     
     private List<String> tags;
     
@@ -75,11 +75,11 @@ public class EPUBImportRequest {
         this.seriesName = seriesName;
     }
     
-    public Integer getSeriesVolume() {
+    public Double getSeriesVolume() {
         return seriesVolume;
     }
     
-    public void setSeriesVolume(Integer seriesVolume) {
+    public void setSeriesVolume(Double seriesVolume) {
         this.seriesVolume = seriesVolume;
     }
     
diff --git a/backend/src/main/java/com/storycove/dto/PDFImportRequest.java b/backend/src/main/java/com/storycove/dto/PDFImportRequest.java
index 6373a19..15b190b 100644
--- a/backend/src/main/java/com/storycove/dto/PDFImportRequest.java
+++ b/backend/src/main/java/com/storycove/dto/PDFImportRequest.java
@@ -19,7 +19,7 @@ public class PDFImportRequest {
 
     private String seriesName;
 
-    private Integer seriesVolume;
+    private Double seriesVolume;
 
     private List<String> tags;
 
@@ -71,11 +71,11 @@ public class PDFImportRequest {
         this.seriesName = seriesName;
     }
 
-    public Integer getSeriesVolume() {
+    public Double getSeriesVolume() {
         return seriesVolume;
     }
 
-    public void setSeriesVolume(Integer seriesVolume) {
+    public void setSeriesVolume(Double seriesVolume) {
         this.seriesVolume = seriesVolume;
     }
 
diff --git a/backend/src/main/java/com/storycove/dto/StoryDto.java b/backend/src/main/java/com/storycove/dto/StoryDto.java
index a52c65b..7f3ac36 100644
--- a/backend/src/main/java/com/storycove/dto/StoryDto.java
+++ b/backend/src/main/java/com/storycove/dto/StoryDto.java
@@ -26,7 +26,7 @@ public class StoryDto {
     private String coverPath;
     private Integer wordCount;
     private Integer rating;
-    private Integer volume;
+    private Double volume;
     
     // Reading progress fields
     private Boolean isRead;
@@ -125,11 +125,11 @@ public class StoryDto {
         this.rating = rating;
     }
     
-    public Integer getVolume() {
+    public Double getVolume() {
         return volume;
     }
     
-    public void setVolume(Integer volume) {
+    public void setVolume(Double volume) {
         this.volume = volume;
     }
     
diff --git a/backend/src/main/java/com/storycove/dto/StoryReadingDto.java b/backend/src/main/java/com/storycove/dto/StoryReadingDto.java
index c7e8edb..733c71e 100644
--- a/backend/src/main/java/com/storycove/dto/StoryReadingDto.java
+++ b/backend/src/main/java/com/storycove/dto/StoryReadingDto.java
@@ -20,7 +20,7 @@ public class StoryReadingDto {
     private String coverPath;
     private Integer wordCount;
     private Integer rating;
-    private Integer volume;
+    private Double volume;
     
     // Reading progress fields
     private Boolean isRead;
@@ -114,11 +114,11 @@ public class StoryReadingDto {
         this.rating = rating;
     }
     
-    public Integer getVolume() {
+    public Double getVolume() {
         return volume;
     }
     
-    public void setVolume(Integer volume) {
+    public void setVolume(Double volume) {
         this.volume = volume;
     }
     
diff --git a/backend/src/main/java/com/storycove/dto/StorySearchDto.java b/backend/src/main/java/com/storycove/dto/StorySearchDto.java
index ea8b6e1..239445f 100644
--- a/backend/src/main/java/com/storycove/dto/StorySearchDto.java
+++ b/backend/src/main/java/com/storycove/dto/StorySearchDto.java
@@ -13,7 +13,7 @@ public class StorySearchDto {
     private String coverPath;
     private Integer wordCount;
     private Integer rating;
-    private Integer volume;
+    private Double volume;
     
     // Reading status
     private Boolean isRead;
@@ -103,11 +103,11 @@ public class StorySearchDto {
         this.rating = rating;
     }
     
-    public Integer getVolume() {
+    public Double getVolume() {
         return volume;
     }
     
-    public void setVolume(Integer volume) {
+    public void setVolume(Double volume) {
         this.volume = volume;
     }
     
diff --git a/backend/src/main/java/com/storycove/dto/StorySummaryDto.java b/backend/src/main/java/com/storycove/dto/StorySummaryDto.java
index 1ac0670..177fd64 100644
--- a/backend/src/main/java/com/storycove/dto/StorySummaryDto.java
+++ b/backend/src/main/java/com/storycove/dto/StorySummaryDto.java
@@ -18,7 +18,7 @@ public class StorySummaryDto {
     private String coverPath;
     private Integer wordCount;
     private Integer rating;
-    private Integer volume;
+    private Double volume;
     
     // Reading progress fields
     private Boolean isRead;
@@ -105,11 +105,11 @@ public class StorySummaryDto {
         this.rating = rating;
     }
     
-    public Integer getVolume() {
+    public Double getVolume() {
         return volume;
     }
     
-    public void setVolume(Integer volume) {
+    public void setVolume(Double volume) {
         this.volume = volume;
     }
     
diff --git a/backend/src/main/java/com/storycove/dto/ZIPImportRequest.java b/backend/src/main/java/com/storycove/dto/ZIPImportRequest.java
index 6fa40d5..808116e 100644
--- a/backend/src/main/java/com/storycove/dto/ZIPImportRequest.java
+++ b/backend/src/main/java/com/storycove/dto/ZIPImportRequest.java
@@ -35,7 +35,7 @@ public class ZIPImportRequest {
         private String authorName;
         private UUID seriesId;
         private String seriesName;
-        private Integer seriesVolume;
+        private Double seriesVolume;
         private List<String> tags;
 
         public UUID getAuthorId() {
@@ -70,11 +70,11 @@ public class ZIPImportRequest {
             this.seriesName = seriesName;
         }
 
-        public Integer getSeriesVolume() {
+        public Double getSeriesVolume() {
             return seriesVolume;
         }
 
-        public void setSeriesVolume(Integer seriesVolume) {
+        public void setSeriesVolume(Double seriesVolume) {
             this.seriesVolume = seriesVolume;
         }
 
diff --git a/backend/src/main/java/com/storycove/entity/Series.java b/backend/src/main/java/com/storycove/entity/Series.java
index 6b2e037..722705c 100644
--- a/backend/src/main/java/com/storycove/entity/Series.java
+++ b/backend/src/main/java/com/storycove/entity/Series.java
@@ -8,6 +8,7 @@ import com.fasterxml.jackson.annotation.JsonManagedReference;
 
 import java.time.LocalDateTime;
 import java.util.ArrayList;
+import java.util.Comparator;
 import java.util.List;
 import java.util.UUID;
 
@@ -62,21 +63,21 @@ public class Series {
     
     public Story getNextStory(Story currentStory) {
         if (currentStory.getVolume() == null) return null;
-        
+
         return stories.stream()
                 .filter(story -> story.getVolume() != null)
-                .filter(story -> story.getVolume().equals(currentStory.getVolume() + 1))
-                .findFirst()
+                .filter(story -> story.getVolume() > currentStory.getVolume())
+                .min(Comparator.comparingDouble(Story::getVolume))
                 .orElse(null);
     }
-    
+
     public Story getPreviousStory(Story currentStory) {
-        if (currentStory.getVolume() == null || currentStory.getVolume() <= 1) return null;
-        
+        if (currentStory.getVolume() == null) return null;
+
         return stories.stream()
                 .filter(story -> story.getVolume() != null)
-                .filter(story -> story.getVolume().equals(currentStory.getVolume() - 1))
-                .findFirst()
+                .filter(story -> story.getVolume() < currentStory.getVolume())
+                .max(Comparator.comparingDouble(Story::getVolume))
                 .orElse(null);
     }
     
diff --git a/backend/src/main/java/com/storycove/entity/Story.java b/backend/src/main/java/com/storycove/entity/Story.java
index 73975bc..dde96e5 100644
--- a/backend/src/main/java/com/storycove/entity/Story.java
+++ b/backend/src/main/java/com/storycove/entity/Story.java
@@ -52,8 +52,8 @@ public class Story {
     @Column(name = "rating")
     private Integer rating;
     
-    @Column(name = "volume")
-    private Integer volume;
+    @Column(name = "volume", columnDefinition = "float8")
+    private Double volume;
     
     @Column(name = "is_read")
     private Boolean isRead = false;
@@ -216,11 +216,11 @@ public class Story {
         this.rating = rating;
     }
     
-    public Integer getVolume() {
+    public Double getVolume() {
         return volume;
     }
-    
-    public void setVolume(Integer volume) {
+
+    public void setVolume(Double volume) {
         this.volume = volume;
     }
     
diff --git a/backend/src/main/java/com/storycove/repository/StoryRepository.java b/backend/src/main/java/com/storycove/repository/StoryRepository.java
index 2e532f6..2cfece2 100644
--- a/backend/src/main/java/com/storycove/repository/StoryRepository.java
+++ b/backend/src/main/java/com/storycove/repository/StoryRepository.java
@@ -37,7 +37,7 @@ public interface StoryRepository extends JpaRepository<Story, UUID> {
     List<Story> findBySeriesOrderByVolume(@Param("seriesId") UUID seriesId);
     
     @Query("SELECT s FROM Story s WHERE s.series.id = :seriesId AND s.volume = :volume")
-    Optional<Story> findBySeriesAndVolume(@Param("seriesId") UUID seriesId, @Param("volume") Integer volume);
+    Optional<Story> findBySeriesAndVolume(@Param("seriesId") UUID seriesId, @Param("volume") Double volume);
     
     
     @Query("SELECT s FROM Story s JOIN s.tags t WHERE t = :tag")
diff --git a/backend/src/main/java/com/storycove/service/CollectionService.java b/backend/src/main/java/com/storycove/service/CollectionService.java
index e05c246..024dbc9 100644
--- a/backend/src/main/java/com/storycove/service/CollectionService.java
+++ b/backend/src/main/java/com/storycove/service/CollectionService.java
@@ -420,7 +420,7 @@ public class CollectionService {
             .orElseThrow(() -> new ResourceNotFoundException("Series not found with id: " + seriesId));
 
         List<UUID> storyIds = series.getStories().stream()
-            .sorted(java.util.Comparator.comparingInt(s -> s.getVolume() != null ? s.getVolume() : Integer.MAX_VALUE))
+            .sorted(java.util.Comparator.comparingDouble((Story s) -> s.getVolume() != null ? s.getVolume() : Double.MAX_VALUE))
             .map(Story::getId)
             .collect(Collectors.toList());
 
diff --git a/backend/src/main/java/com/storycove/service/SolrService.java b/backend/src/main/java/com/storycove/service/SolrService.java
index ef80940..4654885 100644
--- a/backend/src/main/java/com/storycove/service/SolrService.java
+++ b/backend/src/main/java/com/storycove/service/SolrService.java
@@ -1061,7 +1061,8 @@ public class SolrService {
         story.setCoverPath((String) doc.getFieldValue("coverPath"));
         story.setWordCount((Integer) doc.getFieldValue("wordCount"));
         story.setRating((Integer) doc.getFieldValue("rating"));
-        story.setVolume((Integer) doc.getFieldValue("volume"));
+        Number volumeVal = (Number) doc.getFieldValue("volume");
+        story.setVolume(volumeVal != null ? volumeVal.doubleValue() : null);
         story.setIsRead((Boolean) doc.getFieldValue("isRead"));
         story.setReadingPosition((Integer) doc.getFieldValue("readingPosition"));
         story.setReadingProgressPercentage((Integer) doc.getFieldValue("readingProgressPercentage"));
diff --git a/backend/src/main/java/com/storycove/service/StoryService.java b/backend/src/main/java/com/storycove/service/StoryService.java
index 9514216..d113d27 100644
--- a/backend/src/main/java/com/storycove/service/StoryService.java
+++ b/backend/src/main/java/com/storycove/service/StoryService.java
@@ -139,7 +139,7 @@ public class StoryService {
     }
 
     @Transactional(readOnly = true)
-    public Optional<Story> findBySeriesAndVolume(UUID seriesId, Integer volume) {
+    public Optional<Story> findBySeriesAndVolume(UUID seriesId, Double volume) {
         return storyRepository.findBySeriesAndVolume(seriesId, volume);
     }
 
@@ -499,7 +499,7 @@ public class StoryService {
         return storyRepository.save(story);
     }
 
-    public Story addToSeries(UUID storyId, UUID seriesId, Integer volume) {
+    public Story addToSeries(UUID storyId, UUID seriesId, Double volume) {
         Story story = findById(storyId);
         Series series = seriesService.findById(seriesId);
         
@@ -550,7 +550,7 @@ public class StoryService {
         }
     }
 
-    private void validateSeriesVolume(Series series, Integer volume) {
+    private void validateSeriesVolume(Series series, Double volume) {
         if (volume != null) {
             Optional<Story> existingPart = storyRepository.findBySeriesAndVolume(series.getId(), volume);
             if (existingPart.isPresent()) {
diff --git a/backend/src/test/java/com/storycove/entity/SeriesTest.java b/backend/src/test/java/com/storycove/entity/SeriesTest.java
index bec0a7a..34bd993 100644
--- a/backend/src/test/java/com/storycove/entity/SeriesTest.java
+++ b/backend/src/test/java/com/storycove/entity/SeriesTest.java
@@ -104,11 +104,11 @@ class SeriesTest {
     @DisplayName("Should get next story correctly")
     void shouldGetNextStoryCorrectly() {
         Story story1 = new Story("Part 1");
-        story1.setVolume(1);
+        story1.setVolume(1.0);
         Story story2 = new Story("Part 2");
-        story2.setVolume(2);
+        story2.setVolume(2.0);
         Story story3 = new Story("Part 3");
-        story3.setVolume(3);
+        story3.setVolume(3.0);
 
         series.addStory(story1);
         series.addStory(story2);
@@ -123,11 +123,11 @@ class SeriesTest {
     @DisplayName("Should get previous story correctly")
     void shouldGetPreviousStoryCorrectly() {
         Story story1 = new Story("Part 1");
-        story1.setVolume(1);
+        story1.setVolume(1.0);
         Story story2 = new Story("Part 2");
-        story2.setVolume(2);
+        story2.setVolume(2.0);
         Story story3 = new Story("Part 3");
-        story3.setVolume(3);
+        story3.setVolume(3.0);
 
         series.addStory(story1);
         series.addStory(story2);
diff --git a/backend/src/test/java/com/storycove/entity/StoryTest.java b/backend/src/test/java/com/storycove/entity/StoryTest.java
index ee0c3dc..3b1ee29 100644
--- a/backend/src/test/java/com/storycove/entity/StoryTest.java
+++ b/backend/src/test/java/com/storycove/entity/StoryTest.java
@@ -140,7 +140,7 @@ class StoryTest {
         story.setSeries(series);
         assertFalse(story.isPartOfSeries()); // Still false because no volume
 
-        story.setVolume(1);
+        story.setVolume(1.0);
         assertTrue(story.isPartOfSeries());
 
         story.setSeries(null);
diff --git a/backend/src/test/java/com/storycove/repository/StoryRepositoryTest.java b/backend/src/test/java/com/storycove/repository/StoryRepositoryTest.java
index 1e11741..d2311b1 100644
--- a/backend/src/test/java/com/storycove/repository/StoryRepositoryTest.java
+++ b/backend/src/test/java/com/storycove/repository/StoryRepositoryTest.java
@@ -69,14 +69,14 @@ class StoryRepositoryTest extends BaseRepositoryTest {
         story2.setDescription("The sequel to the great adventure");
         story2.setAuthor(author);
         story2.setSeries(series);
-        story2.setVolume(1);
+        story2.setVolume(1.0);
         story2.addTag(tag1);
 
         story3 = new Story("The Final Chapter");
         story3.setDescription("The final chapter");
         story3.setAuthor(author);
         story3.setSeries(series);
-        story3.setVolume(2);
+        story3.setVolume(2.0);
 
         storyRepository.saveAll(List.of(story1, story2, story3));
     }
@@ -126,11 +126,11 @@ class StoryRepositoryTest extends BaseRepositoryTest {
     @Test
     @DisplayName("Should find story by series and volume")
     void shouldFindStoryBySeriesAndVolume() {
-        Optional<Story> found = storyRepository.findBySeriesAndVolume(series.getId(), 1);
+        Optional<Story> found = storyRepository.findBySeriesAndVolume(series.getId(), 1.0);
         assertTrue(found.isPresent());
         assertEquals("The Sequel", found.get().getTitle());
 
-        found = storyRepository.findBySeriesAndVolume(series.getId(), 99);
+        found = storyRepository.findBySeriesAndVolume(series.getId(), 99.0);
         assertFalse(found.isPresent());
     }
 
diff --git a/frontend/src/app/add-story/AddStoryContent.tsx b/frontend/src/app/add-story/AddStoryContent.tsx
index 6e6ce30..c79711a 100644
--- a/frontend/src/app/add-story/AddStoryContent.tsx
+++ b/frontend/src/app/add-story/AddStoryContent.tsx
@@ -285,7 +285,7 @@ export default function AddStoryContent() {
         summary: formData.summary || undefined,
         contentHtml: formData.contentHtml,
         sourceUrl: formData.sourceUrl || undefined,
-        volume: formData.seriesName ? parseInt(formData.volume) : undefined,
+        volume: formData.seriesName ? parseFloat(formData.volume) : undefined,
         // Send seriesId if we have it (existing series), otherwise send seriesName (new series)
         ...(formData.seriesId ? { seriesId: formData.seriesId } : { seriesName: formData.seriesName || undefined }),
         // Send authorId if we have it (existing author), otherwise send authorName (new author)
@@ -308,7 +308,7 @@ export default function AddStoryContent() {
               summary: formData.summary || undefined,
               contentHtml: imageResult.processedContent,
               sourceUrl: formData.sourceUrl || undefined,
-              volume: formData.seriesName ? parseInt(formData.volume) : undefined,
+              volume: formData.seriesName ? parseFloat(formData.volume) : undefined,
               ...(formData.seriesId ? { seriesId: formData.seriesId } : { seriesName: formData.seriesName || undefined }),
               ...(formData.authorId ? { authorId: formData.authorId } : { authorName: formData.authorName }),
               tagNames: formData.tags.length > 0 ? formData.tags : undefined,
diff --git a/frontend/src/app/stories/[id]/edit/page.tsx b/frontend/src/app/stories/[id]/edit/page.tsx
index 78436f4..0b15c7f 100644
--- a/frontend/src/app/stories/[id]/edit/page.tsx
+++ b/frontend/src/app/stories/[id]/edit/page.tsx
@@ -199,7 +199,7 @@ export default function EditStoryPage() {
         summary: formData.summary || undefined,
         contentHtml: formData.contentHtml,
         sourceUrl: formData.sourceUrl || undefined,
-        volume: formData.seriesName && formData.volume ? parseInt(formData.volume) : undefined,
+        volume: formData.seriesName && formData.volume ? parseFloat(formData.volume) : undefined,
         // Send seriesId if we have it (existing series), otherwise send seriesName (new/changed series)
         ...(formData.seriesId ? { seriesId: formData.seriesId } : { seriesName: formData.seriesName }),
         // Send authorId if we have it (existing author), otherwise send authorName (new/changed author)
@@ -222,7 +222,7 @@ export default function EditStoryPage() {
               summary: formData.summary || undefined,
               contentHtml: imageResult.processedContent,
               sourceUrl: formData.sourceUrl || undefined,
-              volume: formData.seriesName && formData.volume ? parseInt(formData.volume) : undefined,
+              volume: formData.seriesName && formData.volume ? parseFloat(formData.volume) : undefined,
               ...(formData.seriesId ? { seriesId: formData.seriesId } : { seriesName: formData.seriesName }),
               ...(formData.authorId ? { authorId: formData.authorId } : { authorName: formData.authorName }),
               tagNames: formData.tags,