Yoshida couple, married for 5 years and 7 months, no children. The wife, Keiko, is 36 years old and works part-time at a restaurant. The husband was previously divorced due to his ex-wife's affair with his superior—an incident that led him to discover his own hidden desires. He confesses to having a cheating fantasy: wanting his new, young, and beautiful wife to have sex with other men. Keiko, raised in an all-girls school and sexually inexperienced, is shocked by her husband's cuckolding desire, but after repeated persuasion, she reluctantly agrees to a three-person trip with a stranger selected to take her. In front of her husband, she is penetrated by another man's cock, her heart and body completely claimed. Trembling from this first-time experience and betraying her husband, Keiko finds herself unable to resist the overwhelming pleasure. A shocking story where love and desire collide.