Kind and charming Mio is beloved by coworkers and customers alike, but behind her perfect appearance she is tired of a marriage that has gone stale. Her coworker Tachibana has long harbored forbidden feelings for her. Worried by her gloomy mood, he finally invites her home and confesses the love he has kept bottled up for years. Mio firmly rejects him at first, but his devotion gradually lowers her guard, setting a dangerous affair in motion.