There was a boy who read ecchi books about oppai (breasts) and fantasized about the big breasted ladies. Then one day, he received a bunch of sex tickets and a letter. Each of the tickets had a photo of a person's bust on the reverse. A girl named Nil appeared, and finding him clueless, explained that he had qualified into the game—he is to search for people to whom the photographed breasts belong. And so his quest to be the Oppai King begins…
