Polar Star High School is located deep in the mountains, hidden from society and was established so students could concentrate on their studies. Kazuki, however, is there for a different reason. He is looking for a girl with 7 beauty marks on her breasts who he promised, when they were younger, to go to Polar Star together and eventually end up marrying each other. Kazuki has to find that girl with whatever method he can. With the help of his friend Haga, they come up with many different plans to see each girl’s boobs, which gets them into worlds of trouble. With beautiful classmates like Minami and Hokuto, what does Kazuki have to lose?