Hagure Yuusha No Aesthetica
Author:Uesu Tetsuto
Illustrator:Tamago no Kimi
Publisher: HJ Bunko
Genre:Young Adult
synopsis:
A mysterious portal have appear and bring chaos to the world.Monsters and demons keep appearing from that portal so an organisation called BABEL was set up to fight the creatures from that gateaway.A brash and delinquent Akatsuki Ousawa and his (adopted?)sister Muu was sent to attend an international high school under BABEl which specialise in fighting demons and monsters from that world.
The protag is gar.Think daimaou and densetsu and even bastard!.Hoping this would get animated