Des:A sister-in-law comes to a sexless couple one day. She is an innocent wife who is criticized for her inability to have children. As her sister-in-law tells her, she undergoes infertility treatment, and the treatment begins, filled with shame. Rikos sexual sensations are stimulated for the first time, and her obscene training brings out Rikos carnal instincts. Before she knew it, Riko turned into a sex addict and she passed away...