Johan thought he knew monotony—long hours at work, nights spent solo gaming. But when he's summoned to Eosdadalon, a world of magic, his friends are hailed as the Heroes of Prophecy, while Johan is cast aside, deemed unworthy.  Stumbling upon the mysterious Sanity System, a power unlike anything the heroes possess, Johan's path veers into the unknown. Meanwhile, the Penumbra—a pitch-black fog consuming everything in its path—creeps across the land, threatening to engulf the world. Outside the prophecy, with no place in its story, Johan must carve out his own path, unlocking the full potential of the Sanity System to help save a world that may never accept him. His journey is no longer about being a hero but about survival.