Wakamaru Ipphei, a middle-aged man unemployed and hopeless about life, lives idly at his older brother's house. One day, his niece Waka Misono suddenly approaches him with a personal concern. She confesses her frustration about being unable to have sex with her boyfriend, and innocently, Ipphei offers to teach her about men, igniting his own hidden desires. That single remark sparks a forbidden relationship that gradually deepens between them. As Ipphei touches Waka's voluptuous body, he discovers new pleasures, and their bond grows stronger each day. Seeking escape from mundane routine and the joy found in physical intimacy, their relationship advances rapidly. Soon, an irreversible connection forms between them.