Tsuihou Sareta Onimotsu Tamer, Sekai Yuiitsu no Necromancer ni Kakusei Suru: The Tale of the Necromancer.

Randall is a tamer who shoulders every grueling task his party demands—from reconnaissance, mapping, and carrying heavy baggage to cooking meals and standing watch through the night. He even willingly absorbs enemy blows to protect his comrades. Yet, despite sacrificing himself daily, his fellow adventurers dismiss him as nothing more than a useless burden. His companions belong to an elite S-ranked party celebrated as the most famous adventuring group in the country. Comprised of genius magicians, exceptional swordsmen, renowned priests, and formidable knights, the team boasts superb coordination and relentless drive. However, behind their widespread popularity and flawless public image, the members harbor deep dissatisfaction with Randall’s presence among them. This simmering resentment ultimately leads to his abrupt expulsion from the very group he dedicated himself to supporting. Cast out by the nation's most celebrated heroes, Randall is left to forge his own path. But his banishment proves to be a catalyst rather than a defeat. Just as he begins establishing his own influence and independence, Randall awakens to a hidden potential far surpassing anything his former comrades could have imagined. Transforming into the world's only necromancer, he unlocks his true power and sets his sights on exacting revenge against those who so carelessly threw him away.