Kind and charming, Mio is the poster girl for her workplace, popular with both colleagues and customers. At first glance, her marriage seems perfect, but she is tired of it as it has become a stalemate. Mio's coworker, Tachibana, has a one-sided love for her that is forbidden. Worried about Mio's lack of energy, Tachibana takes the plunge and invites her over to his house, and in his excitement, he confesses his long-standing love. Mio stubbornly refuses at first, but she gradually lets her guard down as she expresses her sincere feelings... a dangerous love story is about to begin!