To drown men into dazzling pleasure and show them their loved ones in their dreams, that is a succubus. Due to an accident, 17 year old Hourai Riichi is reincarnated as a succubus, due to a misunderstanding by the Reincarnation Support Department. For a succubus to live, she squeezes out a man’s life essence and consumes it, but Riichi as a former male firmly refuses such behaviour. Surprisingly, he does find a substitute, and it is milk. Riichi tries to cope with this new and strange life, while resisting his succubus nature.