Mizuchi/History

Drama Club arc
Having seen her boyfriend and Haru get along so well and learning they slept together, Mizuchi became incredibly outraged and started spreading rumors about the sexual activities of Haru, making her an outcast in school. In her defense Haru argued that her boyfriend came onto her first and was in love with her while he couldn't stand Mizuchi's abusive behavior, thus leading him to dump her. In a fit of fury, Mizuchi dumped water all over Haru and exposes her racism towards Haru, exclaiming that her species is in danger of extinction and that's why their relationship will flourish again to keep them safe, as she saw it as her duty to have children with her boyfriend to save the harlequin species.

Meteor Festival arc
Haru retaliates back one day after the endless amount of harassment and bullying. While she is going off on Mizuchi and insulting her, Legoshi slowly approaches from behind Haru, which startles Mizuchi and her friends. Afterwards, the trio run away screaming. After this interaction, Mizuchi finally leaves Haru alone, most likely afraid of Legoshi. It's later revealed and she and her harlequin rabbit boyfriend are back together.