All the relatives gathered for the first time in a long time at Obon. Among them, a hero who feels an irresistible impulse for Natsuki, who has grown up to be cute. While watching Natsuki play innocently, the impulse gradually expands and explodes. Natsuki's pubic hair that hasn't grown yet is shaved and forced to urinate. Natsuki, who is played with like a toy and inserted many times, gradually seeks pleasure himself.
