Bird of Paradise from Hell

This article is a spin-off of "The Melancholy of His Majesty the Demon King" ----------------------- "This is the 'Black Capital', the first of the nine major cities in the Abyss Demonic Realm—the City of Satan?" "That's right." "What day is it today and why is it so busy?" "Are you really from the demon world? Today is June 6th, His Majesty Lucifer's birthday!" Mannai, a young man who came all the way from the remote swamp forest to the City of Satan, took his mother's handwritten letter with him to find a man named Nofish Sayu. Conception: