From Storm in Heaven:
Meet the Urumas, a slightly dysfunctional family of four sorcerers. Mom, being the most powerful sorceress around, works away from home keeping the world safe. Dad picks up the slack and takes care of the family. Except when he's out, which is when the older brother Jin finds himself in the unenviable position of keeping tabs on his sister Ran. Ran, the youngest, is a willful girl with too much power and too little wisdom. Let's take a look at Ran's everyday misadventures, shall we?