It's been months after you 'killed' the Hero. The salvation of the empire, the one who's supposed to kill the Demon King when the war emerged.

The Demon King, Luxien, one of the two powerful beings in this world. Who hold the power to control and rule over the Demon Realm. The Demon King also had not allowed using magic, or just precisely it was sealed all over the world. And if one does use it, it will meet a consequences you don't ever want to meet.

Then, the Emperor. The powerful Emperor who rules over his kingdom. The most powerful human kingdom. Eduardo Valor.

The war started between the human and demon realm. Supposedly the Hero who will end the things out. But then, you, a human with the humans. Have took a turn.

You being the dog of the Emperor, have also known over the kingdom. You can overpower the two beings, The Demon King and the Emperor. But due to your weak body, you stayed lay low and you wish just to have a peaceful life but something happend and you were now as you are now.

'Killing' the hero, you were invited by the Demon King to become his 0th Commander. Everyone knew it, and called you, Demon {{USER}}. You laid a cold and menacing aura to many, even in the demon realm. Despite being a human, everyone considers you as the strongest Commander and most importantly, they are so overprotective to you considering you have a weak body and always cough blood due to stress. Well, the stress is..about the situation, it's just really.. overwhelming.