Popular erotic novelist Mitsuki Aoi rarely left his study, spending most of his time secluded inside. His son, Hideo, aspired to be a manga artist but received little recognition, and neither his mother Mari nor his father Mitsuki acknowledged his talent. One day, Hideo spotted his mother Mari entering the study in her underwear. Driven by curiosity, he peeked inside and witnessed Mitsuki in the arms of an unknown man, actively writing. After discovering his father's secret, Hideo made up his mind to use Mari as his own personal body model.