A 38-year-old unemployed hikikomori. My niece, who adores me saying 'I love your big body, Uncle.' The uncle, having lost his virginity by teaching his innocent niece about sex, posts videos of their acts on an underground site and meets a man who also has a relationship with his niece. 'How about we exchange our nieces next time?' The uncles enjoy the bodies of 'Noa' and 'Mei,' who are in the midst of maturing, exchanging them to satisfy their further desires...
