Mother Ririko had raised her daughter Natsumi single-handedly, and after finally seeing her married off, she began reclaiming her life as a woman once more. However, one day, Natsumi confided in her about growing tensions with her husband, Kensuke, prompting Ririko to worry and decide to stay at her daughter's home. Overwhelmed by work-related stress, Natsumi struggles to connect with Kensuke, whose attentiveness fails to keep up. Amid this strain, Ririko's gentle care and maternal warmth gradually draw Kensuke to her. Her nurturing nature sparks an unexpected romantic connection, igniting a forbidden passion.