Naraku no Soko de Seikatsu Shite Haya Sannen, Touji "Hakuma Doushi" datta Watashi wa "Kiyoshi Majo" ni Natteita

Lily, a White Mage, receives news that she’s been cut from the party formed with her childhood friends. As a final adventure, she heads to a dungeon with her companions, but they encounter a powerful enemy. She alone is left behind as a decoy. Barely escaping with her life, she plummets to the depths of the abyss—fast forward three years. Lily, now with the mysterious advanced occupation of “Holy Witch,” begins her journey from the lowest level of the dungeon towards the surface! The tale of conquering a dungeon in reverse, starting from maximum difficulty, begins!