Hangyaku no Vallow: Joukyuu Kizoku ni Bousatsu Sareta Gunshi wa Maou no Fukkan ni Tensei Shi, Fukushuu o Chikau

A brilliant human tactician, betrayed and murdered by a corrupt noble, is reincarnated as the demon king's most trusted commander. Swearing vengeance against the unpunished aristocrat, he now wields his strategic genius to reshape a broken world.