Hiroka lives with her son Kenji, as her husband is working away from home. One day, her son's classmate Kazuya, who moved in next door, comes to visit... Kazuya, a bully, has his eye on Hiroka, and when he finds an opportunity, he lures her into sympathy and pushes her down. Before she knows it, Hiroka's body, which has become sexually frustrated, remembers the pleasure of being violated. Before she knows it, she falls for the strength of his youthful cock, and before she knows it, she forgets that he is her son's classmate, and becomes immersed in secret pleasure...