The Secret Job of The Loner

"You've made quite a mess of this city, demon kings... It's been thousands of years since my last war... Let's see who'll win this one, you demon kings... Or us-" "Heroes of the ancient times," ********************************** Highschool. It is the peak of youth for teens, where they could explore themselves, find love, and find true friendships. But not for Ray Lance. As someone who have lived two lives before, he only interested in the technologies of the modern world, and protecting his beloved two little siblings. But as orphans, he have to strive to make living for his two little siblings. With the skills and power from his previous life that surprisingly still resided in his body, Ray protected the city he lives in by making a youkai agency. As a loner who didn't suit the youthful highschool life, he lives his life saving people from the shadows, helping his reincarnated friends and subordinates from his previous lives, offering revenge service to the weak people who couldn't get protected by the men's laws. and protecting the world from the dangers the mortal didn't aware of. And as the one who lives between the real world and the invisible world, he will need to face the troubles from both of the world. Follow his life being a highscool loner, being a youkai boss, being a restaurant owner, and being the world's oldest guardian.