Ootsuki (大月 Ōtsuki?) is a college professor and the foremost Japanese member of the Witch Hunt, an international organization of enthusiasts dedicated to researching the tragedy on Rokkenjima from an occult perspective. The name of this organization was borrowed from the English fan translation group for the game acknowledge by Ryukishi07 himself, "Witch Hunt". Ange interviews him in order to learn more about the Rokkenjima Incident.

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