The middle-aged teacher with a strong sexual appetite, Busujima Tanehisa, is ensnared by a succubus from another world named Lima Grimalkin. While immobilized by a spell, Lima starts to masturbate him, and due to his overabundance of sexual desire, she assigns him the task of re-educating succubi who have failed their exams. He is introduced to two failing succubi, Iko Bicorn and Ruku Orcus, who initially display a rebellious attitude but are subdued using mysterious tools. And so begins the re-education through orgasms of the arrogant, dark-haired succubus, Iko!

The re-education of the failing succubi continues. Next up for education is Ruku, who is initially subjected to a game where she is left half-naked and abandoned… After prolonged torture of being teased without release, Ruku can’t take it anymore and seeks out Busujima’s member on her own… After concluding her education, Ruku realizes something strange about Busujima…! Upon uncovering Lima’s true intentions, Busujima decides to rebel. The time has finally come to give Lima, who has been doing as she pleases without restraint, a disciplinary lesson!