Seven years into their marriage, the Shiraki couple enjoy a stable and peaceful life together. However, lately, the husband has become obsessed with fishing, leaving his wife Yuko feeling slightly neglected. Around this time, a man named Hirai, introduced as the husband's fishing mentor and also his junior at work, joins them on a trip. Hirai proves highly skilled, bringing in an excellent catch, which leaves the husband thoroughly satisfied. As the night progresses, the husband gets completely drunk and passes out, leaving Yuko alone with Hirai. Drawn to Yuko's unconscious allure, and overwhelmed by drunken desire, Hirai moves in on her. With intense, forceful passion, he takes her—and despite herself, Yuko surrenders to the pleasure, giving rise to a new, illicit drama between them.