Shishunki no Obenkyou is a multi-volume doujinshi. The first chapter of this hentai will show us the beginning of the story, about two classmates of Kasuga and her school friend Kobayashi. The girl has an irresistible curiosity and a desire to find out what men look like below, i.e. she wants to see a real penis, and is constantly tormented by these thoughts not knowing what to do. On the same day, her classmate Kobayashi boasts to her about the results of his exam with the maximum score, and the girl matures a simple plan on the go, in response to this, she says that she can beat him in school, and they make a bet: whoever gets the worst score on the next exam will do whatever the winner wants...