diff --git a/titles/mai2/buddiesplus.py b/titles/mai2/buddiesplus.py
index e87fae6..fc0bcfb 100644
--- a/titles/mai2/buddiesplus.py
+++ b/titles/mai2/buddiesplus.py
@@ -58,3 +58,70 @@ class Mai2BuddiesPlus(Mai2Buddies):
                 "friendBonusFlag": False
             }
         }
+
+    async def handle_get_user_friend_check_api_request(self, data: Dict) -> Dict:
+        user1rivalList = await self.data.profile.get_rivals(data["userId1"])
+        user2rivalList = await self.data.profile.get_rivals(data["userId2"])
+
+        is_user2_in_user1_rivals = any(rival["rival"] == data["userId2"] for rival in user1rivalList)
+        is_user1_in_user2_rivals = any(rival["rival"] == data["userId1"] for rival in user2rivalList)
+
+        if is_user2_in_user1_rivals and is_user1_in_user2_rivals:
+            return {"returnCode": 0}
+        else:
+            return {"returnCode": 1}
+
+    async def handle_user_friend_regist_api_request(self, data: Dict) -> Dict:
+        user1rivalList = await self.data.profile.get_rivals(data["userId1"]) or []
+        user2rivalList = await self.data.profile.get_rivals(data["userId2"]) or []
+
+        is_user2_in_user1_rivals = any(rival["rival"] == data["userId2"] for rival in user1rivalList)
+        is_user1_in_user2_rivals = any(rival["rival"] == data["userId1"] for rival in user2rivalList)
+        user1_show_count = sum(1 for rival in user1rivalList if rival.get("show") == 1)
+        user2_show_count = sum(1 for rival in user2rivalList if rival.get("show") == 1)
+
+        # initialize returnCode
+        returnCode1 = 2
+        returnCode2 = 2
+
+        # Case1 no rival
+        if not is_user2_in_user1_rivals and not is_user1_in_user2_rivals:
+            if user1_show_count >= 3 and user2_show_count >= 3:
+                returnCode1, returnCode2 = 1, 1
+            elif user1_show_count >= 3:
+                returnCode1, returnCode2 = 1, 2
+            elif user2_show_count >= 3:
+                returnCode1, returnCode2 = 2, 1
+
+        # Case2 has single rival
+        elif is_user2_in_user1_rivals != is_user1_in_user2_rivals:
+            if is_user2_in_user1_rivals and not is_user1_in_user2_rivals:
+                if user1_show_count >= 3 and user2_show_count >= 3:
+                    returnCode1, returnCode2 = 1, 1
+                elif user1_show_count >= 3:
+                    returnCode1, returnCode2 = 1, 2
+                elif user2_show_count >= 3:
+                    returnCode1, returnCode2 = 2, 1
+            else:
+                if user1_show_count >= 3 and user2_show_count >= 3:
+                    returnCode1, returnCode2 = 1, 1
+                elif user1_show_count >= 3:
+                    returnCode1, returnCode2 = 1, 2
+                elif user2_show_count >= 3:
+                    returnCode1, returnCode2 = 2, 1
+
+        # execute add_rival and show_rival
+        if not is_user2_in_user1_rivals:
+            await self.data.profile.add_rival(data["userId1"], data["userId2"])
+            if returnCode1 == 2 and user1_show_count < 3:
+                await self.data.profile.set_rival_shown(data["userId1"], data["userId2"], True)
+
+        if not is_user1_in_user2_rivals:
+            await self.data.profile.add_rival(data["userId2"], data["userId1"])
+            if returnCode2 == 2 and user2_show_count < 3:
+                await self.data.profile.set_rival_shown(data["userId2"], data["userId1"], True)
+
+        return {
+            "returnCode1": returnCode1,
+            "returnCode2": returnCode2
+        }
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