A widowed mother, having raised her son alone, finally sees her child secure a job and her parenting duties come to an end. Yet, a void of loneliness lingers in her heart. One day, she embarks on a hot spring trip with her son... Only to be confronted with his sudden confession: "I've always loved you, Mom." Despite the taboo, Mari initially rejects him, but her yearning for intimacy proves too strong, and she succumbs to her son's affections, giving in to his advances. This is a tale of incestuous love and pleasure, delivered amidst the secluded mountains of Gunma Prefecture, where a mother and son drown in their forbidden desires.
