Mizunetsu Onzen is a fan of hot springs. All his life he spent looking for the greatest one of all. Now that he dies in what he considers as the best hot spring of all time, a high being reincarnates him as the very hot spring he dies in. Now he's been given the task to make himself as not only the best, but the most popular hot spring of all. Will he be able to make the whole world know of him as the greatest hot spring?