Demon Lord, Retry! R (Manga) Volume 2 by Kurone Kanzaki

En route to Hellion territory in search of answers, the Demon Lord and company explore Animania and encounter its wild inhabitants. Meanwhile, Luna learns that her best friend is among a shipment of slaves being transported to Hellion territory by the powerful and theocratic Tzardom of Light. She rushes North to save her, where the Northern Nations are entangled in an age-old war.