A soul from another world falls into this world of wizards. Will he change the world? Or blend into the world.
The dragon slayer will eventually become a dragon. The old black dragon is still flying, and the new black dragon has spread its wings and is ready to defeat the old king.
A slow-burning plot with many original characters.
Note: The protagonist does not know the plot and uses receiving magic. Recipients: three fierce gods, the Bull Demon King - King Yama - a seventh-ranked demon king
Idea: Try to incorporate a character into the Fairy Tail anime