Fairy Tail's Strongest Ghost Sword

Unknowingly, Yunfei traveled across time, and came to an Otherworld of dragons and magic, where dragons rule the world, and humans are ants and pigs, who are slaughtered and teased by dragons.

It's just that this has nothing to do with Yunfei, because Yunfei doesn't have any magical aptitude, proper fantasy routines, so Yunfei just needs to find a job and be an ordinary person.

"Hey, pick up? What is this stuff... Draw your sword and slash, phantom sword dance?! Fuck! This is Dungeon and Warriors?!"

"You said your name is Natsu Dorag*er?! There is also a genius brother Zeref Dorag*er who is studying at the Mildian Academy of Magic?! Let me go, this is the world of Fairy Tail?!"

In the end, Yunfei finally understood what kind of world he was in, the era when Fairy Tail ruled the world four hundred years ago and acted recklessly.

And Yunfei is, the dragon slayer four hundred years ago!