Who Is More Attractive?

It was explained that it was part of a competition in becoming the chairperson for both schools that this series takes place. It was set up by his and his sister's (Shizu) grandmother. The wager was that both Mariya and Shizu was to dress up as the other and go to the opposite schools (Mariya to the girls' school and Shizu to the nearby boys' school) and do the entire high school curriculum of three years, without having their true gender revealed by any teacher or registered students. Your gender is revealed, you lose. The two look so much alike, the only difference is a mole on their face, Mariya's mole is on the left side of his face, Shizu has hers on the right side of her face.