Hikari, Hibiki, and Mei, the most beautiful girls in the school, are best friends and always hang out together. All three of them fall in love at first sight with a male teacher who is doing his teaching practice! After having a secret physical relationship in an empty library, they fight over his big dick in the nurse's office and in the classroom! Under the pretext of a summer camp, they get their car out and make love like monkeys in a Japanese-style room at a guesthouse!