Keigo's older sister Mizuho is the more formidable of the two—she regularly bosses him around, sending him on errands like vending machine runs, with a swift kick to the groin as her go-to punishment for being late. When Keigo brings home his friends Ikkaku and Yumichika, she welcomes them into the Asano household without hesitation. She claims it's because she wants to be "that kind of sister," but the real reason is pretty straightforward: she has a thing for bald and shaved heads. She's known for turning up the charm around men she's attracted to, speaking in a flirtatious way and making a show of her figure—much to Keigo's embarrassment and frustration.
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