The Little Sister is Metagaming Too Hard!

Ravel Phenex, professional little sister, gamed the system too hard and ended up a little too strong. Unfortunately for her, becoming a harem member is a risk that she's not willing to take, also, her brother is too much of a siscon. She also 'accidentally' the vampires... yeah, that too. Well, at least ultimate cosmic power isn't so far out of reach. A semi-SI story