I, Yusuke Urameshi's Sister, Beat Up the Spirit World

Signed with Tomato Novel Originals! I open my eyes to find I've become Yusuke Urameshi's younger sister, born with maxed-out spirit energy. My brother has only just become a Spirit World Detective, and I've already punched an S-rank demon to pieces. Yomi sneers, Sensui lowers his eyes, and Kurama sighs, “She's even crazier than her brother.” I scoff. This world is ruled by the strong. If I can fight, why bother reasoning? The rules of the Spirit World? One punch, and I'll send them back to the drawing board!