Daichi and Chiharu's only son, Yuta, has an intractable disease and is hospitalized at a university hospital in Tokyo, and surgery requires a huge amount of money. Yanagi, a wealthy man, will pay all of Yuta's surgery costs depending on the conditions, so when Daichi and Chiharu go directly to see Yanagi, he presents him with the condition that he wants to hire Chiharu as a sex slave for a year. . Daichi strongly opposes him, but Chiharu's strong desire to help Yuta gives in and he signs the contract.
