The protagonist of the 3D hentai is not a young and once very successful teacher. Now he no longer works and simply wastes his life. However, one of the usual unremarkable days, he receives a mysterious letter from his former students, asking for help. He urgently got ready and went to the specified address. Upon arrival, he finds a huge mansion, with one of his students waiting for him on the doorstep. Soon he receives an unusual artifact from the girl's hands due to the effects of which he soon begins to lose consciousness. Waking up, he realizes that he must solve some terrible mystery of this mansion...