Which Anime Features A Powerful Son Fighting Demons?

A 25 years old boy named John is suddenly shot by his friend, which results in his death, but is reincarnated again as the new Demon King. Unfortunately, he agains dies in a battle. This time also he is reincarnated but as a human. Follow Vis' adventure as he gets revenge, becomes a demon and makes his own harem.

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My father was the God-King, and he loved my mortal mother with all his heart. To help her adapt to life in the divine realm, he even infused his own blood into her, granting her eternal youth and elevating her to the rank of a goddess. Defying the unanimous opposition of all gods, he built a resplendent palace solely for her here in the divine realm, making her the happiest woman across all heavens. Yet he never loved me — his first child, born of him and my mother. As time went by, he visited my mother less and less frequently. Eventually, I passed away. Mother begged him to seek justice for me, but he only replied indifferently, "We shall have many more children." His words crushed every last glimmer of hope in her heart. Mother grew utterly disillusioned with him, and resolved to avenge me with her own hands. The God-King’s patience toward her dwindled day by day. It was as if I had been born bearing nothing but misfortune. To avenge my wrongful death, Mother cast aside everything she once held dear. When she finally turned her back and left the divine realm forever, that aloof, domineering God-King went mad. He chased after her, begging desperately for her to return.

Ito Akihiko the main protagonist also called as the 'cursed child' due to a past incident has the ability to see spirits from birth. To save the world from turning into something inhumane Akihiko and his comrade Asato Ayame venture through the world with spirits and creatures from stories, myths, rumours and even legends! Will they be able to change the future that lies ahead of them? Well, find it out yourself...

A devil child who was raised by a devil hunter like a human child. Under the auspices of the devil hunter He finds love, affection, shelter, and knowledge without knowing his true self.

He died killing the Demon King. He woke up sixty years too early. Now the monster is a young man. And he is running out of reasons to stay away. --- Lysan Dusk was the hero who saved humanity. He killed the Demon King, ended the war, and delivered the world from suffering, and his reward was betrayal. He wakes up in a young student's body in a dormitory room of a magical academy, and the calender shows that the date sixty years before he was born. The world outside hasn't broken yet. The war hasn't happened. Lysan's plan is to keep it that way by staying completely out of it. Fail his combat exams, spend whatever borrowed time he has left, living a quiet life, where nothing requires him to be a hero. The man who will become the Demon King, the most feared monster in history is still young and beautiful, with pale grey eyes that find Lysan across every crowded room like he is the only person worth seeing. Lysan knows what those eyes will become. He has looked into them across battlefields, spent a lifetime seeing them in nightmares. He never expected it to feel like this up close. Roman is everything Lysan was warned about — magnetic, dangerous, impossible to ignore. Everyone except Lysan, refuses to be charmed, refuses to feel anything at all. But now, he is failing spectacularly at them because Roman keeps finding him. Keeps watching him and making Lysan's carefully rebuilt walls feel like paper. Lysan knows the ending. But for the first time in two lifetimes, he is wondering if the ending can change. If the monster can be loved instead of killed. If staying is braver than running.