Live Dungeon, a legendary MMORPG, mysteriously transports Kyotani Tsutomu to a parallel world moments before its shutdown. Armed with expertise from clearing the game across five PCs, Tsutomu discovers something shocking: dungeon raids in this realm lack any semblance of tactical coordination. Forced into the healer role against his will, he resurrects his beloved White Mage class—a position nobody else wants to fill. Now, Tsutomu must master the art of support magic and strategic dungeon conquest, navigating treacherous encounters with reckless adventurers to unlock the secrets of his return home. In a world where preparation meets pandemonium, can a single healer turn chaos into victory?