diff --git a/server/internal/questflow/scene.go b/server/internal/questflow/scene.go
index 46c5221..0500fe4 100644
--- a/server/internal/questflow/scene.go
+++ b/server/internal/questflow/scene.go
@@ -142,6 +142,12 @@ func (h *QuestHandler) HandleReplayFlowSceneProgress(user *store.UserState, ques
 	user.PortalCageStatus.IsCurrentProgress = false
 	user.PortalCageStatus.LatestVersion = nowMillis
 
+	if user.SideStoryActiveProgress.CurrentSideStoryQuestId != 0 {
+		user.SideStoryActiveProgress = store.SideStoryActiveProgress{
+			LatestVersion: nowMillis,
+		}
+	}
+
 	flowType := h.replayFlowType(user, questSceneId)
 	user.MainQuest.CurrentQuestFlowType = int32(flowType)
 	user.MainQuest.LatestVersion = nowMillis
diff --git a/server/internal/service/portalcage.go b/server/internal/service/portalcage.go
index 3d63f27..da85fcf 100644
--- a/server/internal/service/portalcage.go
+++ b/server/internal/service/portalcage.go
@@ -34,6 +34,12 @@ func (s *PortalCageServiceServer) UpdatePortalCageSceneProgress(ctx context.Cont
 			user.MainQuest.CurrentQuestFlowType = int32(model.QuestFlowTypeMainFlow)
 			user.MainQuest.LatestVersion = now
 		}
+		// Returning to Mama's Room also ends any active side story.
+		if user.SideStoryActiveProgress.CurrentSideStoryQuestId != 0 {
+			user.SideStoryActiveProgress = store.SideStoryActiveProgress{
+				LatestVersion: now,
+			}
+		}
 	})
 	return &pb.UpdatePortalCageSceneProgressResponse{}, nil
 }
diff --git a/server/internal/service/quest_main.go b/server/internal/service/quest_main.go
index a0bb6dd..b668921 100644
--- a/server/internal/service/quest_main.go
+++ b/server/internal/service/quest_main.go
@@ -203,6 +203,11 @@ func (s *QuestServiceServer) SetRoute(ctx context.Context, req *pb.SetRouteReque
 		now := gametime.NowMillis()
 		user.PortalCageStatus.IsCurrentProgress = false
 		user.PortalCageStatus.LatestVersion = now
+		if user.SideStoryActiveProgress.CurrentSideStoryQuestId != 0 {
+			user.SideStoryActiveProgress = store.SideStoryActiveProgress{
+				LatestVersion: now,
+			}
+		}
 	})
 
 	return &pb.SetRouteResponse{}, nil