Based on the adult doujin by BOSSHI. Futabu Mix Futanari World A relaxing vacation at the Manra Valley onsen is just what the members of the Futabu, or Futanari Club, signed up for. Officially, their goal is to research the harvest festival native to the area for a high school project. Unofficially, they’re there to have a little fun, and the springs are an aphrodisiac….