transported in another world as redblade

Killian Chaeveu, a student at age 17 was minding his own business, when suddenly, he was consumed by a magic circles underneath him as he as transported along with his classmate to save the the Presidia kingdom from the oncoming horde of demon.

But Killian was no fool, he has already seen this outcome from lot's of different novels and anime. And with that he swear to kill every corrupt person in this country.

"What do you do when you can't do nothing, but there's nothing you can do?"

"You do what you can."

i own nothing except this story , cover is by @Ksmtk79 on twitter