After Shinichi's father, Ginji, decides to remarry following Shinichi's new job, he introduces his fiancée without knowing she is actually Miku, his former private tutor. Shinichi had secretly harbored feelings for her but couldn't bring himself to celebrate the marriage. Late into the night, he fantasizes about Miku and pleasures himself, while she remains warm and affectionate toward him. One day, Shinichi finally reaches his breaking point and unleashes his pent-up desire on Miku's soft body.