Mayuta's Sister
She's the younger sibling of Mayuta (Andou-san) and clearly looks up to him—she calls him "Mayu-nii" and doesn't hide her admiration.
What's interesting about her is that she's on a mission to find the woman she believes convinced Mayuta to leave his delinquent gang life behind. She's convinced this mystery woman is stronger than her brother, which is basically her way of trying to understand what could've changed him so completely.
In terms of personality, she's got a playful streak. She loves pulling pranks on her opponents using "kancho"—that Japanese schoolyard prank where you poke someone's butt without warning. It's silly and juvenile, but it defines a lot of her fighting style and approach to conflicts.
Content compiled by AnimeList.moe from publicly available sources.
