In her fifth year of marriage, Rin begins to feel an emotional distance growing between her and her husband due to work stress and their increasingly separate lives. Misunderstandings turn into rifts, and the marital bond starts to crack. Carrying her burdens in silence, Rin turns to her boss, Oshima, seeking emotional support. Comforted by his warmth and understanding, they grow closer, sharing their feelings and forming a new, intimate connection. Unconcerned with others' eyes, they secretly engage in passionate affairs. Yet, conflicting emotions begin to stir within Rin. Oshima notices her inner turmoil, silently harboring his own deepening feelings for her.