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- Not to be confused with Reisen Udongein Inaba.
Reisen is a lunar rabbit who fled from the moon to Gensokyo early in the events of Touhou Bugetsushou. She was nursed by Reimu after being injured by space debris. Because of this, Eirin was able to learn of her presence. Because Reisen still had attachments to the moon, Eirin sent her back along with a letter for the Watatsuki sisters. Since fleeing to Earth was a crime, she was sentenced to live as the Watatsuki sisters' pet where she was then given the name Reisen.