After five years of marriage, Manami Oura began working part-time to help support the household. However, she found herself increasingly stressed by workplace relationships. Concerned for her well-being, a friend suggested she take up swimming lessons. Following the advice, Manami started attending classes and grew close to her instructor, Uchimura, finding emotional comfort in their interactions. But when she returned home after a session hoping to unwind, she discovered her husband had secretly spent all the money she had earned at her part-time job. Devastated, she stormed out of the house and wandered aimlessly—until she unexpectedly ran into Uchimura at a park.