An introverted high school student, Souichi Sakuraba, is being bullied severely by the “Yokai” classmates. The bullying escalates, and Souichi’s childhood friend, Azusa, who was the only one who trusted him, is defiled by them. In front of Souichi, who was in the depths of despair, the succubus, Asmode, appeared. Souichi makes a contract with a succubus who possesses a mysterious ability, and decides to make the bully’s loved ones suffer the same pain as himself by “cuckolding” them. The obscene revenge by “NTR” begins.

In order to treat his sister's mental illness, the young man Leo resorts to treatment through magic. There, he meets a magician, Oswald, who enters the patient's psyche in order to treat them. In a world filled with Madness, will they be able to save the patient's heart and get out alive...