Mizuho, Keigo's formidable older sister, regularly sends him on errands, such as retrieving juice from a vending machine, with the standard penalty for tardiness being a kick to the crotch. She gladly welcomes Ikkaku and Yumichika into the Asano residence after Keigo brings them home. Although she initially claims she is hosting them "because that is the kind of sister" she wants to be, she actually has a preference for shaved or bald heads. She tends to speak in a seductive manner and flaunt her figure to men she finds attractive, much to Keigo's dismay.
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