After school, schoolgirls Kokomi and Yume become obsessed with researching erotic techniques. While they always score failing grades in academics, their sexual skills are straight A's, astonishing everyone around them. Kokomi carefully teaches the art of pleasurable tongue use that men love, and Yume practices these techniques, growing increasingly aroused until she climaxes with a vibrator, squirting intensely. They invite their boyfriends and casual sex partners over, kicking off a creampie-filled gangbang party. Their lewd daily lives bring fresh excitement and pleasure again and again.