姉妹催眠 ～Hypnosistar～

A man intruded into an academy and took a girl by means of hypnosis.
To save her, her big sister has to play a game offered by the man.
If the big sister wins the game, he will release younger sister. However,
a piece of her personality will be taken away and he will r*pe
her every time the big sister loses the game.

Her entire personality will be lost if the big sister fails a number of times…