Daichi and Chiharu's only son, Yuuta, is hospitalized in a university hospital in Tokyo due to a severe illness, and surgery requires enormous costs. A wealthy man named Yanagi offered to cover all of Yuuta's surgical expenses if certain conditions were met. When Daichi and Chiharu went to meet Yanagi directly, he presented the condition that he wanted to hire Chiharu as a sex slave for one year. Daichi strongly opposed it, but Chiharu, determined to save Yuuta, ended up signing the slave contract.
