◆A grandson who loves his grandmother and has always seen her as a woman, goes on a hot spring trip alone with his grandmother. He has a desire to have sex with his beloved grandmother, and aims to insert his penis, which is absolutely taboo! ◆The gentle grandmother, who is always smiling, has a youthful body that makes it hard to believe she is in her sixties. To her grandson, she is the most exciting woman in the world. ◆Although she is shy, she takes a mixed bath with her grandson in the hot spring. Her grandson washes her body, but her voluptuous body twitches when he caresses her sensitive parts. ◆The grandson takes advantage of the moment when she falls asleep and touches her body all over, playing with her. As he gets more excited, the act escalates. Can he play with her moist private parts and bring it to forbidden incest sex?