Lake, whose only skill is "Dispelling," was labeled incompetent by his party members, cast out of the group, and left behind deep inside a dungeon. Stranded all alone in a dungeon crawling with monsters and facing a desperate crisis, Lake somehow manages to stumble into a hidden room... And what he finds waiting for him there is none other than an SSS-rank item: "The Ring of the Curse Demon God"! When he immediately uses his dispelling ability on it and equips the ring, a silver-haired, beautiful girl named Miu emerges from it—!