A 38-year-old unemployed hikkikomori. My niece, who adores me saying 'I love your big body, uncle.' The uncle, who lost his virginity by teaching sex to his innocent niece, posts their acts on an underground site and meets a man who also has a relationship with his niece. 'How about we exchange our nieces this time?' The uncles exchange each other's nieces to satisfy their further desires...
