Demon Lord, Retry! R (Manga) Volume 7 by Kurone Kanzaki

The Demon Lord storms the demon Belphegor’s castle to rescue Olgan. Using his overwhelming might and insane luck, the Demon Lord saves her from horrific torture at the hands of her father. When he returns to Rabbi to recuperate, nations all over the continent further their schemes, fearful of the Demon Lord’s mad dash for dominion—all unbeknownst to him as he carries on without a clue.