Kasai's relationships and interactions with other people in the Given manga and anime.
Ritsuka Uenoyama

She seems to get along with Ritsuka very well as a classmate but shows some concern with who he hangs around.

Mafuyu Sato

She becomes extremely jealous and speechless to see Mafuyu and Ritsuka hanging out with each other.

Kasai's friend

She seems to have a close relationship with her friend as they are walking together and talking about certain things, including Mafuyu.

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