MRSS-115 "Let's go hiking together again next year..." To earn money for her son's surgery, his beloved wife signed a one-year contract to be a rich man's sex toy. Fujimori Riko.

In order to save the life of his son, who has an intractable disease, Shingo's wife, Riho, signs a contract to become a meat urinal for a wealthy man named Yoshimoto for one year. Shingo laments his own powerlessness for selling his beloved wife, even for his son's sake. The videos sent by Yoshimoto every week record Riho's training from beginning to end, and Riho, who was showing a bullish attitude at first, gradually becomes Yoshimoto's heart...