Forty-year-old demure housewife Masumi Ooshiro has spent years repressing her overwhelming desires—until one night, they finally explode. She runs away from home and, with nowhere else to go, ends up at the home of a male acquaintance. He agrees to let her stay just for one night, but in exchange, he demands her body as payment. Masumi’s body is flooded with pleasures she’s never experienced in her entire life, marking the beginning of a brand-new chapter.