A large breasted school teacher with short black hair, and a black leather miniskirt, walks down the hall. Typical sexy school teacher fantasy trope.
A dorky male student approaches her and asks her for some help on some homework. The teacher ponders it, but she's suddenly chloroformed from behind by another student. They whisk her away in a push cart.
Full title: [Royal Koyanagi] Sei Penalty Gakuen Goku (Kiyoshi Penalty Gakuen Goku)