MTL - Golden Age Legitimate Fei - ~ 385 Acropolis fell, decided to return to the king

Transmigrated into the world of High School DxD, Roy believed he had been handed a life of luxury and glory. Born into the prestigious Lucifuge family, with his Sister Grayfia as his strict yet devoted older sister, he thought he was destined for greatness. 99,997… 99,998… 99,999… 100,000!!But... reality proved harsher: Roy lacked demonic talent and, despite years of training, remained a Low-Class Devil. his peers effortlessly achieve High-Class status, he’s been trapped in a cycle of endless sword practice and ridicule. Yet, he refused to accept mediocrity. Ten thousand sword swings a day, relentless training.. Until one day..[Ding! The Strongest Demon King System has been activated. Access functions to learn more.]---- High School DxD - Main World!1 - High School of the Dead [●] - First2 - Demon Slayer [●] - Second3 - Akame Ga Kill [●] - Third4 - Bladedance of Elementalers [●] - Fourth5 - Campione [●] - Fifth

Legend says, that there is a great demon, who is the human kind’s public enemy. He is the galaxy federations’ nightmare as he wanted to conquer the whole universe. On the first day, he completely took out the human fleet, plunging them into disorder. On the second day, he declared that he will wipe out the whole federation. On the third day, he declared——that the hero who shot him in their previous battle must marry him, or else, he will destroy everything.

The galaxy federation president and the council members had a long meeting after that. They decided to dispatch a soldier, Wu Xing Yun, and marries him off to the arrogant demon. Wu Xing Yun was once a hero who fought for the nebula, and henceforth, he was tasked—— for the sake human race and the universe’s peace, to eliminate mistresses, settle his matters with the mother-in-law, and fix the man’s crooked ways.

Wu Xing Yun was very perplexed when he asked his commanding officer: “Sir, why did it have to be this way?”

Commanding Officer: “Soldier, bear in mind, that this mission of yours, is for the sake of the universe and mankind’s happiness. You must hold on to your husband, and fight other mistresses! Do you have the confidence to accomplish this task?”

Wu Xing Yun, stood straight, saluted, and instinctively replied: “Sir, yes sir! I will accomplish this task!”

- Description from Novelupdates

“You never loved me anyway, did you?”---------------From the start, Lucy Grey knew her marriage was doomed to fall.She held onto her one-sided love for her husband for two years, but that was not enough to save their marriage.On the day Lucy was diagnosed with ovarian cancer, Landon stayed beside his first love at the hospital.Finally, she realized it was time to let go.On that same night, she signed the divorce agreement and left quietly.But fate dealt a cruel hand as Lucy found out she was pregnant!After three years of searching, Landon finally found her.However, when he stood in front of her doorstep, he never expected a child who looked exactly like him would adorably look up and ask, “Are you my daddy?”

Winged beasts with a hundred-meter wingspan swooped from the skies above.Bloodthirsty creatures weaved and leapt between skyscrapers, in search of prey.Thunderous beasts shrouded in lightning took steps that shook the earth with each stride.Humans hid, trembling in the city ruins, praying for the protection of the World Tree.Outside the city, a gargantuan tree that eclipsed the sun, opened its eyes.“This is the city under my sanctuary. Leave, or meet your death!”In an instant, all beasts submitted.PS: Mutated Animals + Lord genre!Early-stage main storyline: Tame Mutated Animals and establish power.In the mid to late stages, the protagonist can transform into a human.