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…

Based on erotic manga by Shiwasu no Okina. Ayano-sensei has discovered lesbian love with one of her students. One day, she discovers something incredible in the Occult Club’s garbage - a picture of a girl with male genitalia. Determined to get one of her own, she must withstand being cummed inside 100 times…