Utsugi Tomoe ~Kaigyaku Choukyou Seitokai~

A training battle which has the player trading off between both characters in one day cycles. Competing with her sister, the heroine must perfect herself as the more obedient slave.

Caught up in a sibling battle, a family living on the dark side of society.

The peaceful days for virginal, beautiful, and talented student body president Tomoe are at an end as the game to tailor her into the perfect servant begins.

Train her with different types of sexual play!

Group sex, breaking in both holes, torture and humiliation exercises, urination, enema play etc! There are a variety ot training methods to choose from!

[From DLsite.com]