Five years into marriage, Ichiro is an ordinary man going through the motions at work and at home. Exhausted by daily life and constantly rejected by his wife in the bedroom, he finds himself at rock bottom both professionally and personally. One day, through his wife's introduction, he meets Yumi, an insurance saleswoman. Never without a smile, Yumi captivates Ichiro with her big tits spilling out of her clothes and her thick, voluptuous, glamorous body. Then Yumi whispers, "Actually, there's one more contract I'd like to offer you," secretly proposing something far more enticing. Drawn in by her seduction, Ichiro begins walking down a new path.