Sekai o Horobosu Majo o Sodatemasu!!
Alternative title: Let's Raise a Witch Who Will Destroy the World, 世界を滅ぼす魔女を育てます!!, 世界を滅ぼす魔女を育てます！！
Story Overview
Born into a family that trains monsters, Takeru is a "Nurturer." He complies with the Demon King's orders and puts a lot of effort into raising ferocious creatures in order to earn money. He receives a visit one evening from a wounded witch who requests that he train a little girl named Anna. Anna is actually the last living member of a fabled witch line. Will Takeru, the greatest "Nurturer" in the demon realm, and Anna, whose ultimate objective is to destroy the planet, become friends? How will the world turn out?