A student at Chidori High. Rintaro is a very kind and calm person, but his blonde hair and piercings—adopted due to struggles with self-expression in his childhood—have led to many writing him off as a delinquent. The exceptions to this are his close friends at Chidori High, as well as Kaoruko, a girl from an opposing school known as Kikyo Private Academy. After first meeting Kaoruko in his family's cake shop, Rintaro gradually begins to spend more time with her.

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Later, Rintaro falls for Kaoruko and confesses his feelings to her. While this causes some awkwardness between the two at first, she eventually returns his feelings and they begin dating.