The Land of Hot Water and the Land of Frost became the battleground for the 4th Shinobi World War. Konoha evacuated the populations of those lands. Due to widespread environmental desolation caused by the war the previous inhabitants abandoned the lands to settle in various parts of the Five Great Nations. When the abandoned lands were resettled and revitalized as the Land of Whispering Bone after the war, the new owners discovered a dungeon hidden deep in the Land of Frost. The dungeon bore a single inscription engraved on the stone gates above the entrance entitled Man'yōshū (万葉集, literally "Collection of Ten Thousand Leaves", commonly translated as simply "collection of countless words"). Inside, though nearly all of the prisoners had died due to dehydration and starvation, a sole livin