Akari had a boyfriend in her student days with whom she had incredible sexual chemistry. Their sexual compatibility was so good that she couldn't think about anything else. She broke up with him because she realized things couldn't continue like that, but even now, as she's about to marry her fiancé whom she met after becoming a working adult, her ex-boyfriend remains deeply etched in her memory. Then, she receives an invitation to a class reunion. Fearing she might run into her ex-boyfriend again, she declines the invitation...