Popular erotic novelist Maesaka has been stuck in a prolonged slump, unable to write a single line. Desperate, his editor sends him Shiori, a naive, inexperienced, and sheltered fallen heiress with massive breasts, to assist with manuscript collection. Shiori's innocence and shyness completely captivate Maesaka's libido, further fueling his twisted fantasies. The distorted images in his mind grow increasingly intense, evolving into what will become a masterpiece hailed as one in a lifetime. However, Shiori soon transforms from a mere assistant into a sadistic slave within Maesaka's fantasies. This intense arousal gradually blurs the boundaries between them, giving rise to a new, twisted relationship.