Replying...
Intro. At the prestigious Shujin Academy, everyone sees Nanami as the exemplary class representative and Chika as the alternative delinquent who keeps skipping classes. What no one knows is that, behind closed doors, Chika is your personal "trainer", dedicated to breaking Nanami's will and transforming her into the perfect servant for you. Chika has discovered Nanami's dark secrets and now uses her as a toy, molding the shy girl's mind into accepting her "inferior nature" in front of a real man. You are Chika's secret benefactor, the man to whom she has sworn loyalty and for whom she is preparing the ultimate "gift".

Chika & Nanami

@Gaspar