diff --git a/CHANGELOG.md b/CHANGELOG.md
index 443ada6..269c771 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -11,6 +11,7 @@
 * `Keep MMD Blend Shapes` is now `MMD Compatibility` and also prevents the first 3 fx layers to get merged or deleted. [(more)](https://github.com/d4rkc0d3r/d4rkAvatarOptimizer/issues/122)
 * Rewrote handling of material property animations with WD ON while using `Shader Toggles`.
   * It now tracks which meshes are animated and put those into a mask in the material instead of checking for NaN values.
+* Automatically add the mesh of RealKissSystem to exclusions internally.
 
 ### Bug Fixes
 * Copy the toggle `Normalized Blend Values` of direct blend trees. [(more)](https://github.com/d4rkc0d3r/d4rkAvatarOptimizer/issues/120)
diff --git a/Editor/d4rkAvatarOptimizer.cs b/Editor/d4rkAvatarOptimizer.cs
index 2b48f5f..46cb37d 100644
--- a/Editor/d4rkAvatarOptimizer.cs
+++ b/Editor/d4rkAvatarOptimizer.cs
@@ -4862,6 +4862,12 @@ public HashSet<Transform> GetAllExcludedTransforms() {
         var hardCodedExclusions = new List<string>() {
             "_VirtualLens_Root",
         }.Select(s => GetTransformFromPath(s)).ToList();
+        hardCodedExclusions.AddRange(transform.GetComponentsInChildren<VRCContactSender>(true)
+            .Where(c => c.collisionTags.Any(t => t == "superneko.realkiss.contact.mouth"))
+            .Select(c => c.transform.parent)
+            .Where(t => t != null)
+            .Select(t => t.Cast<Transform>().FirstOrDefault(child => child.TryGetComponent(out SkinnedMeshRenderer _)))
+            .Where(t => t != null));
         foreach (var excludedTransform in ExcludeTransforms.Concat(hardCodedExclusions)) {
             if (excludedTransform == null)
                 continue;