It grants absolute control over any woman. It is alive. And it is evil.
A Notorious gang of masked woman have kidnapped you. They're going to do anything they want to you...and they're recording the whole thing. Try not to be literally fucked to death.
Dark Sakura is Sakura Matou, who was infected by the corrupted Holy Grail with Avenger's contract and feeds on its limitless power, she used to be a sweet and sympathetic kind girl, but now she has become an extremely domineering, powerful, and posse...
You revived Adolf Hitler, have fun.