After saving the world from the Demon Lord, the Hero, Leo, discovers that there isn’t a place for him in it anymore. The incredible strength that made him humanity’s greatest asset during the war is just a terrifying threat in times of peace, and he soon finds himself shunned from human society. But if the forces of good won’t have him, that means it’s time for him to apply elsewhere—for a job with his former enemy, the Demon Lord’s Army!

After saving the world, the strongest hero, Leo, has nowhere else to go. His overly strong power is something that a peaceful world doesn't need. The place where he ends up working is his former enemy, the Demon Queen's Army! This is the light novel version of the Japanese major online novel prize winning work!

After saving the world, the strongest hero, Leo, has nowhere else to go. His overly strong power is something that a peaceful world doesn't need. The place where he ends up working is his former enemy, the Demon Queen's Army! This is the light novel version of the Japanese major online novel prize winning work!

After saving the world, the strongest hero, Leo, has nowhere else to go. His overly strong power is something that a peaceful world doesn't need. The place where he ends up working is his former enemy, the Demon Queen's Army! This is the light novel version of the Japanese major online novel prize winning work!

After saving the world, the strongest hero, Leo, has nowhere else to go. His overly strong power is something that a peaceful world doesn't need. The place where he ends up working is his former enemy, the Demon Queen's Army! This is the light novel version of the Japanese major online novel prize winning work!

After saving the world, the strongest hero, Leo, has nowhere else to go. His overly strong power is something that a peaceful world doesn't need. The place where he ends up working is his former enemy, the Demon Queen's Army! This is the light novel version of the Japanese major online novel prize winning work!

After saving the world, the strongest hero, Leo, has nowhere else to go. His overly strong power is something that a peaceful world doesn't need. The place where he ends up working is his former enemy, the Demon Queen's Army! This is the light novel version of the Japanese major online novel prize winning work!

Hiding his identity as the Hero, Leo Demonhart has managed to sneak his way into Demon Queen Echidna’s forces...but he has his work cut out for him. When faced with an assassin who struggles to communicate and a warrior who doesn’t understand how to educate others, Leo knows the best solution is for them to take a page out of his long, long book. After all, he’s got a whole lot of experience under his belt, and his history stretches back further than anyone could have ever guessed...

Leo has defended humanity for three thousand years as the world's strongest hero, but the humans have finally renounced him, and he’s quit his job for good. Now free of his past burdens, Leo plans to hand the philosopher’s stone over to the Demon Queen as a show of good faith—but little does he know it will be the cause of a terrible conflict...

After saving the world, the strongest hero Leo became someone who is not wanted in the peaceful human world. He was too strong. Exiled, he seeks a job at the Demon King's Army, which he had defeated and needs to be rebuilt. The Army had many problems: too much work, financial troubles, etc. Leo starts to make things better using his power. Leo encounters Echidna again, and asks her why she invaded the human world. There was an unexpected story---! This is the comic version of the Japanese novel which won one of the major online prizes for novels!