Summoned Healer's Other World Dungeon Conquest

You were summoned as a hero, but assigned the role of healer and cast out from the kingdom as dead weight. You collapse at the entrance to a dangerous new dungeon in the frontier, where you're rescued by Rizelia Valgrain, a powerful mage commander in white and gold armor. She discovers that your healing magic possesses a unique ability: stabilizing magical power itself. Together, you venture into the dungeon, which has become impassable due to a raging magical storm. As the two of you overcome traps and monsters while supporting each other, your power allows Rizelia to cast magic beyond her normal limits, and the two of you begin a journey to conquer dungeons across the land.