Misato Wakana is the mother of Ui Wakana in the series. Despite being over forty years old, she possesses a remarkably petite and youthful appearance that leads others, including Hayato Izumi, to mistake her for Ui's younger sister upon first meeting. Her personality is energetic and playful, often coming across as childlike and innocent, yet she also displays a mature and easygoing side, such as when she lightly overlooks provocative behavior from other characters. She was a close friend of Hayato's deceased mother, Kyoka, and together with Hayato's parents, the two families made a promise during a drink that led to the arranged engagement between Ui and Hayato. For a time, Misato was believed to be living in Canada, but she eventually returns home and visits the school, where her presence and youthful looks continue to cause humorous misunderstandings. Her role in the story is that of a supporting character whose past arrangement sets the central relationship in motion, and her occasional appearances add comedic and familial depth to the narrative.