After being reborn in a parallel world invaded by dimensional rifts, the protagonist awakens a system and unlocks the peak template of Kibutsuji Muzan, the ultimate boss from Demon Slayer.

He becomes the First Demon — the absolute ruler of all demons.

With the ability to distribute his blood to other lifeforms and transform them into demons, he is classified by the Human Alliance as a Legendary-Level Disaster.

The Twelve Demon Moons he personally created shake the world, becoming a terrifying organization feared by everyone.

Years later, when the Human Alliance finally defeats the Epic-Level Disaster: Abyssal Demon Worm, they make a shocking discovery inside the monster’s eye.

A sealed mark.

“Lower Rank… Five?”

The creature they paid such a heavy price to defeat…

Was merely the discarded former Lower Rank Five of the Twelve Demon Moons.

...

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