Hibiki, Shion

響詞音

Shion Hibiki initially appears as a positive, cheery, and outgoing girl. She carries a small kitten named Nya, whom she considers her only family.
Shion transfers to Mochinoki Middle School, where Kiyomaro attends. Upon her arrival, every male student becomes extremely infatuated with her, pummeling her with questions and trying to get her attention. After introducing herself, Nya, her "pet cat," reveals herself, much to the principal's chagrin. All of the male students, excluding Kiyomaro, try to persuade the principal to let Nya stay, citing the fact that Kiyomaro brings a kid to school (to which Kiyo exclaims that he doesn't bring him, as Gash comes of his own free will) and that even the principal brings his wife, so he lets it pass.

Spoiler

She only appears in the anime and not in the manga.