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, a white mage who belongs to an A-rank adventurer party, is expelled from the party as a useless person who cannot move after using Heal once. Only one dagger was handed over. Left alone in the SSS-rank dungeon, Labyrinth of Yggdrasil, he prepares for death... *"You're the first human to reach this far."* As if being guided by something, Rei meets Norn, a mysterious girl who lives in the lowest level of the dungeon, World Tree! Rei, who obtained infinite magical power, was trained by Norn to survive in this harsh dungeon. *"Norn, I..."* There was something left unfinished. The boy who has become the strongest returns to earth with only one knife in his hand. The strongest high-fantasy begins here!

(Source: Kadokawa, translated)