Suzuka's son, Kazuya, brings his friend Yuuki over to play. Yuuki is both Kazuya's friend and the child of Suzuka's friend, but in reality, he has the blood of an incubus. Upon reaching of age, signs of Yuuki's awakening as an incubus appear. Unconsciously emitting the pheromones of an incubus, Suzuka, who is affected by these pheromones, goes into heat and proceeds to take Yuuki's first time. Unbeknownst to Yuuki, this event causes him to fully awaken as an incubus. Following his instincts, he begins to violate and corrupt Ryoka's body, molding her into...