diff --git a/include/parts.h b/include/parts.h
index c1d52ad..6a43539 100644
--- a/include/parts.h
+++ b/include/parts.h
@@ -26,6 +26,8 @@ struct string;
 bool PE_Init(void);
 void PE_Update(int passed_time, bool message_window_show);
 void PE_UpdateParts(int passed_time, bool is_skip, bool message_window_show);
+void PE_SetDelegateIndex(int parts_no, int delegate_index);
+int PE_GetDelegateIndex(int parts_no);
 bool PE_SetPartsCG(int parts_no, struct string *cg_name, int sprite_deform, int state);
 bool PE_SetPartsCG_by_index(int parts_no, int cg_no, int sprite_deform, int state);
 bool PE_SetPartsCGSurfaceArea(int parts_no, int x, int y, int w, int h, int state);
diff --git a/src/hll/GUIEngine.c b/src/hll/GUIEngine.c
index 2b81059..fb37f43 100644
--- a/src/hll/GUIEngine.c
+++ b/src/hll/GUIEngine.c
@@ -505,7 +505,7 @@ HLL_LIBRARY(GUIEngine,
 	    HLL_EXPORT(Release, PE_ReleaseParts),
 	    HLL_EXPORT(ReleaseAll, PE_ReleaseAllParts),
 	    HLL_EXPORT(ReleaseAllWithoutSystem, PE_ReleaseAllPartsWithoutSystem),
-	    HLL_TODO_EXPORT(SetDelegateIndex, GUIEngine_SetDelegateIndex),
+	    HLL_EXPORT(SetDelegateIndex, PE_SetDelegateIndex),
 	    HLL_EXPORT(GetFreeNumber, PE_GetFreeNumber),
 	    HLL_EXPORT(IsExist, PE_IsExist),
 	    HLL_TODO_EXPORT(PushController, GUIEngine_PushController),
@@ -522,7 +522,7 @@ HLL_LIBRARY(GUIEngine,
 	    HLL_TODO_EXPORT(PopMessage, GUIEngine_PopMessage),
 	    HLL_TODO_EXPORT(GetMessagePartsNumber, GUIEngine_GetMessagePartsNumber),
 	    HLL_TODO_EXPORT(GetMessageDelegateIndex, GUIEngine_GetMessageDelegateIndex),
-	    HLL_TODO_EXPORT(GetDelegateIndex, GUIEngine_GetDelegateIndex),
+	    HLL_EXPORT(GetDelegateIndex, PE_GetDelegateIndex),
 	    HLL_EXPORT(GetMessageType, GUIEngine_GetMessageType),
 	    HLL_TODO_EXPORT(GetMessageVariableCount, GUIEngine_GetMessageVariableCount),
 	    HLL_TODO_EXPORT(GetMessageVariableType, GUIEngine_GetMessageVariableType),
diff --git a/src/parts/parts.c b/src/parts/parts.c
index 8a3bbec..d47f7ab 100644
--- a/src/parts/parts.c
+++ b/src/parts/parts.c
@@ -32,6 +32,7 @@ static struct hash_table *parts_table = NULL;
 static void parts_init(struct parts *parts)
 {
 	memset(parts, 0, sizeof(struct parts));
+	parts->delegate_index = -1;
 	parts->on_cursor_sound = -1;
 	parts->on_click_sound = -1;
 	parts->origin_mode = 1;
@@ -47,7 +48,6 @@ static void parts_init(struct parts *parts)
 	parts->rotation.z = 0.0;
 	TAILQ_INIT(&parts->children);
 	TAILQ_INIT(&parts->motion);
-	gfx_font_init();
 }
 
 static struct parts *parts_alloc(void)
@@ -70,6 +70,14 @@ static void parts_list_insert(struct parts_list *list, struct parts *parts)
 	parts_engine_dirty();
 }
 
+struct parts *parts_try_get(int parts_no)
+{
+	struct ht_slot *slot = ht_put_int(parts_table, parts_no, NULL);
+	if (slot->value)
+		return slot->value;
+	return NULL;
+}
+
 struct parts *parts_get(int parts_no)
 {
 	struct ht_slot *slot = ht_put_int(parts_table, parts_no, NULL);
@@ -537,6 +545,7 @@ bool PE_Init(void)
 {
 	parts_table = ht_create(1024);
 	parts_render_init();
+	gfx_font_init();
 	return true;
 }
 
@@ -555,6 +564,17 @@ void PE_UpdateParts(int passed_time, possibly_unused bool is_skip, possibly_unus
 	parts_engine_dirty();
 }
 
+void PE_SetDelegateIndex(int parts_no, int delegate_index)
+{
+	parts_get(parts_no)->delegate_index = delegate_index;
+}
+
+int PE_GetDelegateIndex(int parts_no)
+{
+	struct parts *parts = parts_try_get(parts_no);
+	return parts ? parts->delegate_index : -1;
+}
+
 bool PE_SetPartsCG(int parts_no, struct string *cg_name, possibly_unused int sprite_deform, int state)
 {
 	if (!parts_state_valid(--state)) {
diff --git a/src/parts/parts_internal.h b/src/parts/parts_internal.h
index cc81ea9..ad4d729 100644
--- a/src/parts/parts_internal.h
+++ b/src/parts/parts_internal.h
@@ -178,6 +178,7 @@ struct parts {
 	TAILQ_ENTRY(parts) parts_list_entry;
 	struct parts_list children;
 	int no;
+	int delegate_index;
 	int sprite_deform;
 	bool clickable;
 	int on_cursor_sound;
@@ -200,6 +201,7 @@ struct parts {
 
 // parts.c
 extern struct parts_list parts_list;
+struct parts *parts_try_get(int parts_no);
 struct parts *parts_get(int parts_no);
 struct parts_cg *parts_get_cg(struct parts *parts, int state);
 struct parts_text *parts_get_text(struct parts *parts, int state);