On the way home from her first class reunion in 10 years with her husband, Norihiko, she ends up having drinks with her friend Taniyama at his house... Taniyama has secretly harbored a twisted desire for Yuko since their school days, and takes action to make her his own. Before she knows it, Yuko has been implanted with an electric pleasure that she could never experience with her husband. Since that day, Taniyama has visited Yuko at every opportunity and toyed with her. Just as Yuko is beginning to accept him deep in Kokoro, Norihiko notices a change in her...