An ordinary housewife named Misaki's daily life suddenly changes when she discovers her son Yoshio masturbating with underwear. Searching online for a solution, she ends up on an adult toy website, becomes intrigued, purchases some items, and begins indulging in masturbation herself. However, mere self-pleasure no longer satisfies her, and she gradually becomes tempted by the local dry cleaner. Meanwhile, Yoshio grows uneasy about his mother's increasing sexual desire, secretly feeling envy and jealousy. These emotions eventually erupt, leading to a forbidden relationship between mother and son.