間部由希

Second year student at Kashima Academy, Serina's best friend and classmate.
The only one member of the Kasuga Independent Gang with common sense.
Albeit having a quiet and *****-like personality, she still is unable to stop Serina's rampage, thus always scolded along with her. 
She developed feelings toward Tatsuya since junior high school, but as she knows about his unrequited love with Serina, and Yuki really can't break the ice.
She's great at cleaning and cooking, a family-oriented girl. 
She has been playing the piano since her childhood and is fond of animals.