The Last Demon King

Legend has it that there is a shop in the city that can grant any wish you have. As long as you can pay enough price, such as... Morality? There was another shop owner who traveled through countless planes with a strange crow, harming children one after another. What kind of legends have been buried in the desolate floating tower? What happened behind the buried history? When you walk into this store, everything will be revealed before your eyes