diff --git a/spec/system/constructPresentationState.spec.yaml b/spec/system/constructPresentationState.spec.yaml
index 85cf15f..a3d3a03 100644
--- a/spec/system/constructPresentationState.spec.yaml
+++ b/spec/system/constructPresentationState.spec.yaml
@@ -384,3 +384,95 @@ out:
     characterId: "bob"
     content:
       - text: "Second ADV line"
+---
+case: nvl-mode-maxLines-trims-oldest
+in:
+  - - dialogue:
+        mode: "nvl"
+        gui:
+          resourceId: "nvl-layout"
+        characterId: "narrator"
+        content:
+          - text: "Line 1"
+    - dialogue:
+        mode: "nvl"
+        characterId: "alice"
+        content:
+          - text: "Line 2"
+    - dialogue:
+        mode: "nvl"
+        characterId: "bob"
+        content:
+          - text: "Line 3"
+    - dialogue:
+        mode: "nvl"
+        characterId: "narrator"
+        content:
+          - text: "Line 4"
+    - dialogue:
+        mode: "nvl"
+        maxLines: 4
+        characterId: "alice"
+        content:
+          - text: "Line 5"
+out:
+  dialogue:
+    mode: "nvl"
+    gui:
+      resourceId: "nvl-layout"
+    characterId: "alice"
+    content:
+      - text: "Line 5"
+    lines:
+      - content:
+          - text: "Line 2"
+        characterId: "alice"
+      - content:
+          - text: "Line 3"
+        characterId: "bob"
+      - content:
+          - text: "Line 4"
+        characterId: "narrator"
+      - content:
+          - text: "Line 5"
+        characterId: "alice"
+---
+case: nvl-mode-maxLines-no-trim-under-limit
+in:
+  - - dialogue:
+        mode: "nvl"
+        gui:
+          resourceId: "nvl-layout"
+        characterId: "narrator"
+        content:
+          - text: "Line 1"
+    - dialogue:
+        mode: "nvl"
+        maxLines: 4
+        characterId: "alice"
+        content:
+          - text: "Line 2"
+    - dialogue:
+        mode: "nvl"
+        maxLines: 4
+        characterId: "bob"
+        content:
+          - text: "Line 3"
+out:
+  dialogue:
+    mode: "nvl"
+    gui:
+      resourceId: "nvl-layout"
+    characterId: "bob"
+    content:
+      - text: "Line 3"
+    lines:
+      - content:
+          - text: "Line 1"
+        characterId: "narrator"
+      - content:
+          - text: "Line 2"
+        characterId: "alice"
+      - content:
+          - text: "Line 3"
+        characterId: "bob"
diff --git a/src/stores/constructPresentationState.js b/src/stores/constructPresentationState.js
index 922ed63..86c616a 100644
--- a/src/stores/constructPresentationState.js
+++ b/src/stores/constructPresentationState.js
@@ -180,6 +180,16 @@ export const dialogue = (state, presentation) => {
       characterId: presentation.dialogue.characterId || null,
     });
   }
+
+  // Handle NVL maxLines trimming (scroll effect)
+  if (
+    presentation.dialogue?.maxLines &&
+    state.dialogue?.lines?.length > presentation.dialogue.maxLines
+  ) {
+    state.dialogue.lines = state.dialogue.lines.slice(
+      -presentation.dialogue.maxLines,
+    );
+  }
 };
 
 /**
diff --git a/vt/specs/dialogue/nvl-mode.yaml b/vt/specs/dialogue/nvl-mode.yaml
index 689952d..368fcab 100644
--- a/vt/specs/dialogue/nvl-mode.yaml
+++ b/vt/specs/dialogue/nvl-mode.yaml
@@ -170,8 +170,58 @@ story:
                   content:
                     - text: "Second line on the new page."
 
-            # Back to ADV
+            # maxLines scroll effect
             - id: "8"
+              actions:
+                dialogue:
+                  mode: nvl
+                  clearPage: true
+                  content:
+                    - text: "[maxLines test] Line 1 - This should scroll away."
+
+            - id: "9"
+              actions:
+                dialogue:
+                  mode: nvl
+                  characterId: alice
+                  content:
+                    - text: "[maxLines test] Line 2 - This should scroll away."
+
+            - id: "10"
+              actions:
+                dialogue:
+                  mode: nvl
+                  characterId: bob
+                  content:
+                    - text: "[maxLines test] Line 3 - Stays visible."
+
+            - id: "11"
+              actions:
+                dialogue:
+                  mode: nvl
+                  content:
+                    - text: "[maxLines test] Line 4 - Stays visible."
+
+            - id: "12"
+              actions:
+                dialogue:
+                  mode: nvl
+                  maxLines: 4
+                  characterId: alice
+                  content:
+                    - text: "[maxLines test] Line 5 - Line 1 should be gone now."
+
+            - id: "13"
+              actions:
+                dialogue:
+                  mode: nvl
+                  maxLines: 4
+                  characterId: bob
+                  content:
+                    - text: "[maxLines test] Line 6 - Lines 1-2 should be gone."
+
+            # Back to ADV
+            - id: "14"
               actions:
                 dialogue:
                   mode: adv