On the school bus, everyone is a predator. With her G-cup breasts driving her to madness, a teacher, male students, and passengers—all turned molesters—leave no escape. Once the school's idol, 'Yuka' becomes the target of aggressive male classmates after a class reshuffle, enduring a terrifying third semester. Screaming for help brings no salvation, as the school bus transforms into a whirlpool of sexual desire.