Megumi lives happily with her son Satoshi, but loneliness grows while her husband remains overseas on a long assignment. One day, her son’s longtime friend Kazuma visits to watch a combat-sports match and suddenly confesses his feelings before kissing her. Her heart races despite her better judgment. When he presses her again, she accepts another kiss and gradually becomes addicted to the forbidden pleasure, surrendering to days of sex and creampies with her son’s friend.