>breaks the lock on your window & waltz into your room whenever, without a care for your privacy
>gets aggressive whenever another girl talks to you
>her way or the highway, too hard header to even consider compromising
>refuses to admit she's wrong, even when she knows she's in the wrong
>constantly insults & belittles you: "useless", "pathetic", "virgin", etc
There are many, many bad things about Chisato.

tl;dr Chisato's a bitch!