Ikuiku Succubus Saikyouiku. A middle-aged teacher with a strong sexual appetite, Busujima Tanehisa, is ensnared by an otherworldly succubus named Lima Grimalkin. While paralyzed by a spell, Lima begins to masturbate him, and due to his excessive sexual desire, Lima assigns him the task of re-educating a succubus who failed a test. She is introduced to two failed succubus, Iko Bicorn and Ruku Orcus, who initially show rebellious behavior but are subdued using mysterious tools.