Pet lunar rabbit of Houraisan Kaguya, apprentice to Yagokoro Eirin, and caretaker of earth-born rabbit youkai Inaba Tewi. Her power is to cause lunacy with her stare, as well as control all kinds of wavelengths. Ironically, Reisen is also depicted as one of the more level-headed characters of the series. Doujins make fun of her danmaku, which vaguely resemble suppositories, as well as her rabbit ears, which look as though they were buttoned onto her head. She is also the only character with a "normal" outfit - in this case a blazer/blouse and a pleated skirt, resembling an ordinary Japanese schoolgirl.
Person: rabbit girl, rabbit ears, rabbit tail, red eyes, purple hair, light purple hair, very long hair
Outfit: blazer, black jacket, white shirt, collared shirt, blouse, pink shirt, red necktie, buttons, puffy short sleeves, long sleeves, pink skirt, blue skirt, white legwear, bobby socks, brown footwear, loafers, shoes
Accessories: lunatic gun, crescent pin, carrot pin