妹じゃなくてお姉ちゃんだもん is a free simulation game developed by Team Moko App. This game allows players to experience a cute girl's love story and is suitable for both fans of sister games and those new to dating simulations. In the game, players take on the role of an older sister who is trying her best to act like a proper older sister, but often ends up being treated like a younger sister. As the player's level increases, the character gradually becomes more like a true older sister. The game features simple touch controls and random events that occur when selecting different locations in the house. By completing these events, players can increase their character's level and unlock new conversations. With a maximum level of 30, players can enjoy the game until they reach the end.妹じゃなくてお姉ちゃんだもん is a charming and enjoyable dating simulation game that can be played for free on Android devices.