Crimson Curse: The Vessel of Two Kings

Kazuki Hayashi died a nobody.
No family. No legacy. Just another nameless soul fading into the cold silence of a rainy alley-until crimson eyes offered him a second chance.

Reborn by Rias Gremory as her Rook, Kazuki finds himself thrust into a world of devils, fallen angels, and sacred gears. But something followed him back from death-something ancient, cruel, and impossibly powerful.

A voice in his head. A curse in his veins. A monster with four arms and a throne of corpses.

Ryomen Sukuna-the King of Curses.
And he's not staying quiet for long.

Haunted by nightmares, hunted by enemies, and feared even by his new allies, Kazuki walks the line between salvation and total collapse. Every time he draws on Sukuna's power to protect the people he cares about-Rias, Akeno, Asia, even the cold-eyed Koneko-he inches closer to becoming the thing he fears most.

But in the shadows of death, love might be the only thing that keeps him human.

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"You died a human. I brought you back a devil. But what are you now, Kazuki?"
-Rias Gremory