55-year-old Midori Sawada lives a devoted family life with her husband and son. She met her husband at work, married, and was blessed with a son whom she raised with great care. Even now, it's their habit to bathe together, and their parent-child bond remains deeply strong, unchanged even after he reached adulthood. One day, her son told her in the bathroom that his girlfriend had broken up with him, and for some reason, Midori felt happy—she kissed him. Since then, her son, who had secretly desired her body all along, continues to pursue her every single day...