I ended up in the body of the last heir of an ancient and powerful family. I have special power and authority over ancestral magic. I am superior to everyone in this world with the knowledge and skills from my past life. I will be great. And this is inevitable, like the passage of time and the death of the world. And it would even be easy... But. The butt-handed magician who called me into this body, along with his memory and abilities, left the previous owner with an idiotic sense of humor. All I have to do is lose control a little and my mouth lets out a joke that turns even allies into enemies. Now you’re thinking, “Oh, this is a cute little thing, it can’t ruin your life!” Your mother thought so too.