Ritsuko Ohta

Girlfriend of Koshi and mutual friends with Ogino (after they get introduced via Koshi). She is a brash girl, constantly tagging along with Koshi even when he doesnt want to. She is deeply infuatuated with him, but her personality makes Koshi feel restricted so he decides to break up their relationship. Despite her attributing this mainly to Ogino initially, they continue being friends even after this.