Nyuujoku Hitozuma Jogakuen ~Ingoku no Yakan Hitozuma Choukyou Gakka (Nibu)

There is a unique class at this school - marriage training. It is supervised by director's son who trains girls into slaves there. Moreover, he has strict principles to qualify for admission. It's to have a G cup or bigger. He forces women to wear uniforms with their breasts exposed and participate in various humiliating activities.

[From vndbreview]