I'm the Mysterious Leader of the Salvation Organization - Chapter 524:

The hero who was killed by the demon king ended up reincarnated as the son of the one who killed him! Thus began the life of the hero who donned in the mask of the ideal demon prince to topple his own kingdom while doing his best to prevent anyone from discovering his identity―― But to do that and blend into the demon tribe society, he had to kill his former comrades. Nevertheless, to become stronger, to save humanity, he had to walk through all kinds of paths of carnage! This is the tale of the demon race’s fake prince destroying his own kingdom.

O Hero, Trample Those Who You Should Protect!

TN: Most part of the other character in the novel is depicted from a non-human perspective so expect something that is completely different from the common sense of human.

The world is separated into three realms: Aegaryn, Terranis, and Abyssion.Terranis and Abyssion realms have been in disharmony as the Demon King of Abyssion aims to overthrow all the other realms. In the tackling of this and to help the humans of Terranis defend themselves from the demons,A street orphan becomes a sacrifice in a summoning ritual for an S-rank beast. But he is given a golden opportunity of a lifetime as he is transmigrated into a hyena. Guided by a mysterious system that helps him unlock his boundless potential, he evolves with each rank upgrade, a feat no one of his kind has ever known. His journey is one of transformation, both in form and spirit. Each evolution brings new powers and challenges as he is summoned into deadly wars, cruel betrayals, and battles that threaten the very balance of the realms.Along his journey, he meets a summoner whose kindness and ideals are a stark contrast to all the summoners that he had met previously. Unlike the others, she treated him differently. Gave him a name. Through her, he begins to question his path, torn between his primal instincts and the flickering remnants of his humanity.But as the Demon God stirs in the shadows, threatening to collapse the realms into chaos, he must rise to face his ultimate destiny. To protect those who matter, to shatter the chains of servitude, and to ascend to the pinnacle of power—Ash must embrace his boundless evolution and become a force unlike any the realms have ever seen.

Dancing on the point of a knife, as a dancer in the dark, his dance steps makes the enemy tremble.

As a man who is followed by the goddess of fortune, he has been reborn with two years of experience in the game, numerous raid experience, hidden task guide and the best equipment references. The things he once lost, what he didn’t hold and those that had been taken, he is going to get them back.

- Description from Novelupdates

Transmigrated into the world of Bleach, yet with no cheat, no special talents—just the meager edge of foresight. Higashi Shuuichi couldn't help but curse: “What the hell kind of advantage is that?!”So he made a swift, ruthless choice—cling tight to Aizen, survive his chaos first, worry about everything else later!