Marina married a man who already had a son and developed a warm relationship with her adult stepson, Kazuya. She desperately wanted a baby and had been trying to conceive with her husband, but he was suddenly sent away on a long-term assignment. At first, living alone with Kazuya caused no trouble. Then his touching became increasingly intimate, leaving Marina uneasy. His advances grew bolder until he finally barged in while she was bathing.