Kasai is a character in the Given series and a classmate of Ritsuka.
Appearance
Kasai has short persian orange hair with similar colored eyes and wears a light brown school uniform with a white undershirt and a red string tied in a bow around the collar.
Personality
She is very honest and truthful about her feelings towards others, but get's jealous over other people's relationships, especially Ritsuka and Mafuyu. She discussed matters openly with her friends and was the first to have some notion of Rituka's feelings concerning Mafuyu.
Story
Kasai and her friend walk together through Shibuya only to spot Ritsuka and Mafuyu. Her friend happens to know something about Mafuyu and begs to tell her.