After divorcing, a son raised single-handedly by his mother. One day, after her son had found a job, she planned a parent-child-only hot spring trip using her son's vacation. The son's feelings for his young and beautiful proud mother had somehow become twisted... 'I love you, Mom...' Hibiki was shaken by the sudden confession. Unable to hold back, the son presses against his mother. In the impending pleasure, perhaps she herself had been hoping for this too. Hibiki also finds herself seeking sexual pleasure... The coupling of a mother and child desiring each other at a Koshu inn...
