Hiromi is a high school girl who has never had a boyfriend but has always enjoyed matchmaking. Riko (her younger sister) is experiencing her first love. To make it a success, Hiromi tries to find out who is the special someone in her sister’s heart. To her surprise, it is Nan–best known to be the school’s most flirtatious guy. It would appear that Hiromi has to face her toughest matchmaking challenge ever.