Chisato Wakamiya

Chisato, also known as Chi-chin, is depicted as the most mature of the three Ginsei girls. She is almost eaten by the homunculus Jinnai when he attacks Ginsei High's dorm, but she is saved by Tokiko. Like Mahiro, she has no memory of what happened, but eventually remembers when Dr. Butterfly and the L.X.E. attacks Ginsei High. In "Buso Renkin After," she is seen taking an interest in Gōta when he transfers to Ginsei High.

(Source: Wikipedia)