Rio, who married Kazuyuki, the only son of Shigeo, her boss at work, lived a life of complete satisfaction. However, Rio had a certain thought that she could not tell her husband. It was her feelings for Shigeo... Kazuyuki and Rio got married because they wanted to be together. Rio continued to suppress her feelings, thinking that just being close to him was enough, but as she spent more and more time with Shigeo, she could no longer control Kokoro or body, and she ended up seducing Shigeo...