The Demon King's Romantic Journey

Here lies His Majesty Juanjuan, the 132nd Demon King of the Abyssal Realm. A great king. A pure king. When angels besieged the Demon Realm and a food crisis struck, His Majesty Juanjuan resolutely cut his own rations for the sake of the people of the Abyss: he ate only ten tons of food per meal! Underfed, His Majesty Juanjuan's magical powers declined. After fighting the damn angels for ten days and ten nights, he died of exhaustion! The people of the Demon Realm will remember His Majesty Juanjuan forever! May His Majesty Juanjuan rest in peace in the Abyss, where there are no damn angels! - The Epitaph of Juanjuan the Great Demon King But instead of dying, Juanjuan tumbled into the human world, where a damn angel grabbed him by the tail and inspected him. Juanjuan: ...Epitaphs are all lies meant to fool demons! * Deep in the forest at the far northern edge of the human world lived a reclusive mage named Brigitte. One day, the mage found a little black ball on an outing. It bared its teeth and cursed up a storm, but its heart-shaped tail went limp when he squeezed it. The problem was, it had something wrong with its head. It called itself the Great Demon King and called him an angel. Brigitte, who bore a prophecy of world destruction, was known behind his back as the Unspeakable Great Demon King and had just set out to destroy the world: ...? * A hundred years later, a minstrel told the tale: The Demon King who would destroy the world set out on his journey. The little black monster was his only companion. From the snow-covered Dwarf Forest to the warm, fragrant Elven Rainforest; from the merfolk islands where rivers flowed into the sea to the towering, desolate Ridge of Despair. The handsome young man with black hair and his pet became an inescapable nightmare for countless people, and a memory they could never forget. In the end, of course, the world remained safe and sound. As for the Demon King and his pet, no one knew where they went. * The above is the embellished version. In reality, it went like this. -After being picked up by a damn angel: Juanjuan the Great Demon King's daily question: Did Juanjuan kill that damn angel today? Brigitte: Sorry, no. -After picking up a clever pet with something wrong with its head: Brigitte the Great Demon King's daily question: Did Brigitte destroy the world today? Juanjuan: No, hahaha, you idiot- Mmph! * Juanjuan and Brigitte: Everyone says you're the Demon King. I'm the only one who knows you're an... (Juanjuan: Who ate that damn thing?!) angel. * A male lead who's sweet on the outside but dark within, then dark on the outside but a total softie inside, x a gluttonous, lecherous, adorable little girl who's fiercely protective A road-trip and travel story set in an independently made Western fantasy world, following two overpowered characters on their world-destruction (love) journey. Theme: You love the human world, and I love you.