Demon Lord, Retry! R (Manga) Volume 4 by Kurone Kanzaki

As the city of Suneo hurries to recover from the destructive battle between the Mock Angel and Ancient Devil, the Demon Lord returns to his Secret Base in Animania. There, he learns of a slave market system in Hellion Territory and decides to gather intel while sowing chaos for the Devils. Along the way, he meets many new faces, finally reaching a band of Anima at the edge of the forest...