Terahashi, who has a bad behavior and can't fit in with his classmates, gets into a fight with local delinquents during the school trip, which is the highlight of his student life, and gets scolded by his female teacher, Ai. Terahashi shows no signs of remorse, but he accidentally peeks at Ai taking a bath. He thought that Ai-sensei was a plain old lady, but she has such big breasts and is so sexy... When Ai notices that Terahashi's cock is so hard it hurts, she smiles mischievously, presses her big breasts against him, and whispers dirty words. "You act like a bad boy, but you're such a slacker, making me hard like this..."