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Rito Tsukimi (月見 璃兎)Riko Tsukimi is the homeroom teacher for Tooru and Julie in Kouryou Academy. She has just graduated as a student from Kouryou then became a teacher. She knows all of Sakuya's secrets and is also an acquaintance of her.
Since Tooru has a duo of the opposite gender, most of her perverted jokes are directed towards him, which causes misunderstandings around him.
(Source: Absolute Duo Wikia)