SSS-Rank Dungeon de Knife Ippon Tewatasare Tsuihou Sareta Shiro Madoushi: Yggdrasil no Noroi ni Yori Jakuten de Aru Maryoku Fusoku o Kokufukushi Sekai Saikyou e to Itaru

Rei is a white mage serving in an A-rank adventurer party, but his severe magical deficiency makes him a liability—casting a single healing spell drains him entirely, leaving him immobilized. Deemed useless by his companions, he is unceremoniously expelled and abandoned deep within the SSS-rank Labyrinth of Yggdrasil. Armed with nothing but a solitary dagger handed to him upon his banishment, Rei resigns himself to death on the dungeon's unforgiving floors. However, fate intervenes when he encounters Norn, a mysterious girl residing at the lowest level of the World Tree dungeon, who remarks that he is the first human to ever reach such depths. Guided by her presence, Rei undergoes grueling training designed to help him survive the labyrinth's lethal environment. More importantly, through the curse of Yggdrasil, he finally overcomes his crippling lack of magical power, unlocking a wellspring of infinite mana that transforms him into the strongest being in existence. Yet, despite his newfound supremacy, something remains unfinished. With only a single knife in hand, the boy who has conquered his greatest weakness ascends from the abyss and returns to the surface world, ready to face whatever awaits him.