After her husband's death, Aoi lives with her stepson. The teenage son finds the young and beautiful Aoi stimulating, and Aoi, feeling lonely, gradually develops feelings for her son. One day, they have a physical relationship, becoming repressed due to their sense of betrayal towards her husband and his father. To cheer themselves up, the two decide to go on a hot spring trip. Mistakes are repeated... The mother washes her son's member, such a mother makes the son aroused. In the hot spring town, the twisted love between mother and child intersects lewdly in this tale of forbidden love and incest.
