Are There Major Differences Between The Ishura Novel And New Demon King War Anime?

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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Serra is a normal senior high school student who works really hard every night and weekend to pay off her parents' debts from loan sharks. But when she couldn't keep up with payments anymore, she decided to end her life. Surprisingly, she woke up in a different light-- in another world. What's more shocking was when she is addressed by one of the people as the demon king's bride.

"The trials ahead to prove my worth? I'll crush them !! Enemies? I'll slaughter them!! " Waking up in a new body and a new world after dying on Earth, Tsarayu embarks on a new journey in a world filled with gods and demons. A world where myriad of life forms exist and humans can cultivate and become immortals. Watch him rise to prominence with a supreme inheritance and his hard work as he slaughtered everyone who stood in his path. Watch His journey as he became known in the Universe as the Demon God, the ruler of death forcing the heavens to bow before him. Known as the second inheritor, what happened to the first one? Who does this legacy belongs to? What secrets is the universe hiding?

The Demon King’s Bride The entire kingdom fears him. With white hair, piercing blue eyes, and a heart sealed by cruelty, King Edrion is known as the Demon King—a ruler who accepts betrothed brides… only to turn them into concubines and discard them without mercy. When a young noble lady is promised to the king, her fate seems sealed. But she refuses to give up her freedom—or the man she secretly loves: a guard from her own household. Desperate, they devise an unthinkable plan—to have a poor girl, identical to the noble, take her place as the royal bride. The girl agrees to assume a life that is not hers, believing she will become nothing more than another forgotten concubine in the shadow of the throne. What no one expected… is that the king would choose her. Now destined to become queen to the most feared man in the kingdom, trapped in a lie that could cost her life, she must survive the court, a forbidden desire, and a king who was never meant to look at her the way he does. Because the Demon King does not love. But when he chooses… he neither forgives nor lets go.

Miaka Von Speltsper, the myth, the legend and the daughter of two Gods. Miaka, the Demon King and the head of the Dark Council is the most powerful demon ever known to mankind, but she has a secret. She’s a hybrid. And the world she lives in has hunted down and eliminated every single hybrid in all the dimensions. But now…someone knows her secret, someone who has the power to destroy her. However, the world is changing and one of those changes is Kaleb Takeshi, the man with extraordinary eyes who has stolen Miaka’s heart with just one glance. But there is something about Kaleb that Miaka can sense but can’t describe. And not only is he human, he’s an enemy who has decided to give his loyalty to her. In this world of lies, deceit and betrayal; can Miaka trust her heart or will she have to choose century’s old traditions to stay alive? Because if she dies, it will truly be the end of the world.