diff --git a/animation.blend b/animation.blend
index d33d331d7..7b405465d 100644
Binary files a/animation.blend and b/animation.blend differ
diff --git a/io_scene_vrm/importer/import_scene.py b/io_scene_vrm/importer/import_scene.py
index 1658e4e47..9bb465b98 100644
--- a/io_scene_vrm/importer/import_scene.py
+++ b/io_scene_vrm/importer/import_scene.py
@@ -315,49 +315,3 @@ def menu_import(
     menu_op: bpy.types.Operator, _context: bpy.types.Context
 ) -> None:  # Same as test/blender_io.py for now
     menu_op.layout.operator(IMPORT_SCENE_OT_vrm.bl_idname, text="VRM (.vrm)")
-
-
-class IMPORT_SCENE_OT_vrma(bpy.types.Operator, ImportHelper):  # type: ignore[misc]
-    bl_idname = "import_scene.vrma"
-    bl_label = "Import VRM Animation"
-    bl_description = "Import VRM Animation"
-    bl_options = {"REGISTER", "UNDO"}
-
-    filename_ext = ".vrma"
-    filter_glob: bpy.props.StringProperty(  # type: ignore[valid-type]
-        default="*.vrma", options={"HIDDEN"}  # noqa: F722,F821
-    )
-
-    def execute(self, _context: bpy.types.Context) -> Set[str]:
-        foo()
-        return {"FINISHED"}
-
-    def invoke(self, context: bpy.types.Context, event: bpy.types.Event) -> Set[str]:
-        return cast(Set[str], ImportHelper.invoke(self, context, event))
-
-
-def foo() -> None:
-    import bpy
-
-    bpy.ops.object.select_all(action="SELECT")
-    bpy.ops.object.delete()
-    while bpy.data.collections:
-        bpy.data.collections.remove(bpy.data.collections[0])
-
-    bpy.ops.icyp.make_basic_armature()
-    assert bpy.ops.vrm.model_validate() == {"FINISHED"}
-
-    armature = bpy.context.active_object
-    print(str(armature))
-
-    action = bpy.data.actions.new(name="new action")
-    action.frame_end = 70
-
-    if not armature.animation_data:
-        armature.animation_data_create()
-    armature.animation_data.action = action
-
-    armature.location = (0, 0, 0)
-    armature.keyframe_insert(data_path="location", frame=0)
-    armature.location = (1, 0, 0)
-    armature.keyframe_insert(data_path="location", frame=50)
diff --git a/io_scene_vrm/registration.py b/io_scene_vrm/registration.py
index 92c4d93ae..4bc3d8f6e 100644
--- a/io_scene_vrm/registration.py
+++ b/io_scene_vrm/registration.py
@@ -312,7 +312,6 @@ def save_pre(_dummy: object) -> None:
     import_scene.LicenseConfirmation,
     import_scene.WM_OT_vrm_license_confirmation,
     import_scene.IMPORT_SCENE_OT_vrm,
-    import_scene.IMPORT_SCENE_OT_vrma,
     import_scene.VRM_PT_import_unsupported_blender_version_warning,
     # importer.blend_model.ICYP_OT_select_helper,
     preferences.VrmAddonPreferences,