HEZ-762 Secretly meeting with the father of his son's classmate at a weekly underground happening bar. The married mother Kanna Misaki, who is addicted to the thrill of being watched having sex, is frustrated and seeking fulfillment outside her marriage.

Kanna, who became involved in an affair with the father of her son's classmate, was one day invited to a hapning bar by her lover. However, it turned out to be an illegal members-only club. Seeing other people having sex for the first time at the hap bar, she felt an abnormal excitement and before she knew it, she was sucking her lover's penis. Then, in front of everyone, she became addicted to the sensation of orgasming during sex. As she continued to visit the shop once a week as invited, her sense of morality gradually warped, and she began to display lewd behavior that didn't seem like that of a married woman or mother…