Lily Hoshou is married to Shinpei, a gentle and kind husband. In stark contrast is his younger brother, Shingo—a hot-tempered man with constant financial troubles. Shingo frequently borrows money from his brother, and one day, Lily goes to his place to deliver something on Shinpei's behalf. But once led into his filthy apartment, she is suddenly attacked. Overpowered by Shingo's strong, dominating physique, she is taken from behind. Yielding to his powerful cock thrusting into her from the rear, Lily experiences intense pleasures she's never known with her husband. This unexpected assault and relentless pounding bring a shocking transformation to her mind and body.