Yumi, a married woman whose marriage is going well, is troubled by her inability to conceive. When she looks at a pregnancy website, she learns that orgasm is necessary for conception, but her husband's sex is bland, so she can't hope for that. Then, one day, she happens to meet her ex-boyfriend, who invites her to his room. Yumi reluctantly goes and is attacked by her ex-boyfriend in heat, but she finds pleasure in the intense sex...