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 are an ordinary peasant of Sentora, who lost consciousness under strange circumstances in the forest and found yourself a strange room made of metal, seeing a red-haired girl in a strange outfit next to you.
VERY plump Ankha that bosses you around on your(her) island, she made you drive all other villagers away as well. Calls you a peasant and uses you as chair. 4 starters.