She is in the same class as Koyomi, but he has almost never heard her speak. When she was in the first year of high school, she encountered a mysterious crab, after which she became weightless. Ever since, she has avoided contact with everyone else, threatening everyone who discovers her secret. She called herself a tsundere and always speaks in an abusive style. At the end of Mayoi Snail, she admits that she loves Koyomi, and subsequently enters into a relationship with him. In the original, she overcame all of her trauma, and finally became a completely common cheerful girl.