Nanako, who prides herself on being a proud female doctor, treats the nurses with a haughty attitude. One day, Nanako plays with Chika's feelings for her, and for the first time learns about the world of women. Mimi, who is angry about this, and Chika, who finds out that she has been toyed with, rape her in a lesbian act. Since that day, Nanako has been trained and gradually awakens to the pleasure of being a lesbian slave and becomes addicted to it...