A Guide to Raising a Villainess

I reincarnated as the aunt of the main villainess in a romantic otome game.Ever since I took on this role, my main goal has been to properly raise my niece so that she would not suffer the fate of her character in the original story.But... why has the world around me become so strange ever since I moved into this game?The love interests of the main heroine, who suddenly started hanging around me, even though they are supposed to be with the heroine!The main heroine, who suddenly said to me:"Aunt Grace is the best!"And finally, my niece, who was the main villain in the game, was definitely the strangest of all."You promised that you would take care of me, didn't you? So how can you break your word now?"No, damn it, I was only trying to raise my villainess niece properly... so what is wrong with this strange world?!