IM QUITTING HEROING GN (2025)

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!

Leo, the strongest hero, is reemployed in the Demon Queen's tattered army! Just as he is about to begin the reconstruction, two of the Four Generals go AWOL! It's time for Leo to put his accumulated knowledge and martial prowess to work and bring about some real innovation, which amounts to...millennias' worth of experience?! What is the secret of the mightiest champion?

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...

Leo has officially joined the Demon Queen's army to foster peace between humanity and demons. But now he has a new challenge on his plate-clearing the underground dungeon inside the Demon Queen's castle, which is chock-full of steamy tricks and traps! And on top of that, the Demon Heart series returns to life...?!  

Behind the incident of blackened wyverns attacking a human town lies the curse-maker Canaan and a reawakened member of the Demon Heart series-Leo's brother, Virgo. Leo is determined to stop his sibling before he wreaks any more havoc, so he seeks him out for a confrontation...

Former hero Leo and his friends in the Demon Queen's army head back to the demon realm, only to find a terribly polluted environment. At this rate, the demon realm is sure to be destroyed in a year...so it's time for Leo to roll up his sleeves and get to work on saving the land! Meanwhile, the Demon Queen Echidna has a problem of her own to take care of...?!

In order to find out the cause of water pollution in the Demon Realm, Leo and Mernes head off to investigate Lake Amia and its resident water spirit, Undine. But one thing stands in their way-the legendary "Demon King Slayer," who swears to protect Undine at all costs! Just who is this mysterious foe?! Meanwhile, Demon Queen Echidna puts her plan into motion, donning a perfect disguise to confer with Leo about her troubles...

In order to protect the peace of the demon realm, Aquarius, along with the Hero, Leo, Demon Queen Echidna, the water priestess Crocell, and the Four Great Guardians, prepare to take action. Will Aquarius be able to rescue her good friend Undine from her rampage?! The tale of reviving the Demon Queen's worn-out army comes to a thrilling conclusion!?