The Demon Lord's adventures continue. After meeting a mysterious entity at the bottom of the Bastille Dungeon, he heads for Hellion Territory, where Grand Devils compete to rule the land. Back home, Rabbi Village keeps growing under his subordinates Isami Tahara and Yuu Kirino, which frees Hakuto Kunai to travel in search of items that can counter magic. A hidden laboratory inside the Prison Labyrinth in Rookie Town shows him technology far more advanced and dangerous than anything else in the world. Meanwhile, the newly founded Queendom of Xenobia turns its attention to Rabbi Village, hoping to set the Holy Kingdom of Light and the State of Right against each other. Kunai now has a new aide, Akane Fujisaki, an apparently hopeless optimist whose arrival makes his army even more colorful and its antics even sillier. Blending action, comedy and fantasy adventure, this continuation adapts the light novels by Kanzaki Kurone, illustrated by Iino Makoto.