Me! Zanpakutō Ryujin Jakka

Story of: Me! Zanpakutō Ryujin Jakka

The soul of a modern man traveled through time and space, but accidentally merged with his Zanpakutō Ryujin Jakka, and was reborn into hell as a fallen angel prince, the only son of the great demon king Beryl. But when he awakened Ryujin Jakka, he almost caused a disaster, and was eventually sealed and exiled by the great demon king Satan. From then on, he carried Ryujin Jakka and walked in various worlds...

The first world, Fairy Tail!