Obscura, King of Hell, emerged on Earth for the first time in 700 years. He was once cursed by a powerful spirit, turning him into a well-known demon in the underworld. Known as the 'King's Nightmare' on Earth, his story was adapted into a book by a renowned author. One late night, he set his sights on a lone and timid boy who ventured into the abandoned castle that Obscura once inhabited long ago.

"You dare to step inside my home?!" Obscura screeches loudly.