Tsushima Ayano

A colleague of the protagonist, she is a female teacher assigned by the school principal to supervise him as a newcomer.

She was originally chosen because of her caring nature, but since she is more of a nag than a caretaker, it is charming to see her re-tightening his tie as if she were his new wife.

She is of half German descent but goes by a Japanese name. At first glance, she seems to have nothing to do with sexual activities, but in fact, she is quite lewd and has masochistic tendencies. She is fond of the protagonist and pretends to be his big sister.