Mayu, a wife, has decided to live with her husband's parents to save up money for a new home. For a while, she lives a peaceful life, but... one day, her father-in-law Toshiro returns home in high spirits after winning a million-yen bet. Toshiro, who has a strong libido, gets excited when he sees Mayu, who is defenseless and not impressed, and he uses this to somehow get intimate with her... He frames Mayu as the culprit for the loss of the million-yen bet, and exploits her weakness to rape her in one go. But it doesn't end there...