Miyu is an independent, headstrong, and very kind classmate of Ran and one of her closest friends. However, behind her romantic and cute cover lies a dark past. When she was in third grade, her parents divorced (her father is currently remarried) and she lived with her mother, who paid more attention to looking for a new man rather than to see Miyu grow up (she despised Miyu because she reminded her of her divorced husband).
She once was the leader of a street gang called the "Resistance", often wreaking mayhem and irritation during middle school and had a rough-mannered and threatening personality that Ran despised. One day, Yamato (by then a rookie cop) saved her from a tough situation, and his dedication to helping with Miyu's problems made her fall in love with him. Because of that, she left the life of crime and became a much more polite girl after Yamato told her his wish for her to be good and eventually became great friends with Ran. However, she remains an incredible fighter and can get back to her bullying self when someone completely upsets her and when she becomes uncharacteristically furious.
In conversation, she has a habit of referring to herself in the third person, as many 'cutesy' characters tend to do. Ran often remarks how Miyu is "lovey-dovey" with her older brother and there is a running gag on both series when they interrupted when they are trying to kiss, usually by Ran.
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