Kasai's relationships and interactions with other people in the Given manga and anime.
| Ritsuka Uenoyama |
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She seems to get along with Ritsuka very well as a classmate but shows some concern with who he hangs around.
| Mafuyu Sato |
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She becomes extremely jealous and speechless to see Mafuyu and Ritsuka hanging out with each other.
| Kasai's friend |
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She seems to have a close relationship with her friend as they are walking together and talking about certain things, including Mafuyu.