I was in the body of the last heir of an ancient and powerful family. I have special power and authority over generic magic. I surpass everyone in this world with knowledge and skills from my past life. I'll be great. And it is inevitable, like the passing of time and the death of the world. And it would be even easier...But. The ass-wielding magician who called me into this body, along with memory and abilities, left the former owner and an idiotic sense of humor. Once I lose control a little and my mouth gives out a joke, from which even the allies become enemies. You're thinking, "Oh, that's a nice little thing, it can't ruin your life!"