Maou Slow Life wo Mankitsu Suru: Yusha kara "Kouryaku Mura" to Iwareta kedo, Soko wa Dungeon Janai. Tomato Hatake da

Can a tomato field really become the foundation of a nation?! An exiled priest builds a kingdom from the ground up! Cello, a priest of light, shields the Hero from the Sixth Demon Lord's curse—only to be transformed into a demon himself. As his reward, he is cast out of the Hero's party and forcibly teleported far away. At his destination, Cello encounters Lucy, the Sixth Demon Lord's daughter, who recognizes in him the potential to become a Demon Lord. Together with the demons now serving under him, Cello sets out to develop his new territory. Then, one day, the Hero's party arrives to eliminate him. But when they venture into the tomato field outside Cello's castle, they discover monsters lurking among the crops—each one enhanced by Cello's abilities! What was supposed to be a simple field of tomatoes may prove to be the most unconquerable dungeon of all! (Source: Hanashi Media, edited)