SSS Rank Dungeon de Knife Ippon Tewatasare Tsuihou Sareta Shiro Madoushi: Yggdrasil no Noroi ni yori Jakuten de aru Maryoku Fusoku wo Kokufuku-shi Sekai Saikyou e to ItaruA White Mage Who Was Exiled After Being Handed a Knife in an SSS-Rank Dungeon: Due to the Curse of Yggdrasil, He Overcame His Weak Point, Lack of Magical Power, and Became the Strongest in the World; 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; ＳＳＳランクダンジョンでナイフ一本手渡され追放された白魔導師　ユグドラシルの呪いにより弱点である魔力不足を克服し世界最強へと至る

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!