After five years of marriage, Manami started a part-time job to support the household budget but felt stressed about her interpersonal relationships at work. Seeing her in this state, a friend suggested she join a swimming class. Following the advice, she found herself able to vent her complaints to the instructor, Uchimura, and felt refreshed. However, upon returning home after clearing her mind, she discovered that her husband had been spending the money she earned from her part-time job. In shock, she fled the house and, feeling lost, met Uchimura in a park...