Reina runs a company together with her husband, and they've worked hard to build their business. Despite overcoming the crisis caused by economic downturn, their situation takes a turn when a complaint arrives from Mr. Otsuka, a department manager at one of their key client companies. Reina desperately apologizes and tries to show her sincerity, but Otsuka refuses to accept it and erupts in anger. Exploiting her vulnerability, he shifts the conversation from business to a personal affair, pressuring her into a romantic relationship. To protect her husband and their company, Reina suppresses her true feelings and unbuttons her shirt. This single fateful decision drastically alters the course of everything that follows.