My Witches are Really *Quite* Dumb

In this world, killing a witch doesn't make you a hero. It makes you a target. Fuyu learned that at a year and a half old, when he accidentally became the most famous witch hunter in the region, the most hated man among the most dangerous immortal beings in the world, and the only idiot willing to charge for it. Witches are reborn. They remember everything. And they hate him deeply. Too bad none of them dare to tell him.