Taichi, the son, was raised with nothing but warm affection from his mother, Juri. Over time, however, his feelings for her began to shift from filial love to romantic desire, a passion he kept deeply hidden. Resolved to bury these emotions forever, Taichi remained silent—until his father left home for another woman. Afterward, Juri often spoke of her memories with her husband, lamenting her loneliness. Witnessing her sorrow stirred intense jealousy within Taichi, leading him to lash out at her with harsh, unreasonable words—an outburst born from repressed love. One day, noticing Juri's lingering sadness and lack of motivation, Taichi decides to take her on a hot spring trip, hoping to lift her spirits and draw closer to her.