Demon Slaying!

The corrupted mana of a Devil leaking into the world created demons.

Their vile mana degraded a person's magic, aura, and body. The changes ranged from growing horns, extra arms or even a head—it was a mutation, but sometimes extremes existed too.

His arms shifted with an eerie momentum, like a millipede's dozens of arms swayed while the masked human-shape approach Julian and Fran.

"Julian, wake up. This isn't a normal monster, right?" Fran's eyes narrowed as she plucked three arrows from her quiver and jumped onto a thick branch before aiming at the stationary male with her throat humming in preparation. "Don't hold back!" 

Fwoosh—beautiful blue and pink arrows twirled through the air after she shot three arrows in rapid succession, hooking the branch with her long feet before twisting and dashing to another branch, leaping through the air.