Between the order and the year, a teenage girl challenged a contest in which she had to guess her boyfriend's cock from a row of 10 cocks in the most primitive girl-on-top position! If she succeeds, she wins one million yen! If she fails, she's punished with an intense game of middle-out. The challenger this time is the super cute sunny girl "Sunflower"! She accepts the challenge with her much older boyfriend, a company president who at first glance looks like he's looking for a "godfather". Blindfolded, she penetrates him in the girl-on-top position, memorizing the shape of his cock...