Choubatsu Yobikou: Season 1

An elite high school had another face hid in the dark side. In return for sending sex salves to the collages, they received a lot of money as contributions. Those who trained sex slaves were disposable teachers (trainers) who could keep the secrets. They hired talented men as temporary teaches to train. If they found a promising person, they asked him his will and made him take a test. The test was to lecture those who were defined as problem students. However, lecture is merely nominal, and actually it was training for sex slaves. If he achieved a good result, he would get a qualification of teacher (trainer).