Ultimate Underworld: Out of Prison and Straight into a Hidden Life as a Battle-Hardened Demon

The rules of the Ultimate Universe are simple: the strong prey on the weak, and might makes right.

One night on Old Street, Lin Yu, known as KO.10 “Fierce Demon,” slaughtered his way through a hundred-man ambush, soaking the street in blood. The price was a life sentence in the Esper Prison and shackles all over his body. Two years later, an unknown force powerful enough to alarm the Earth Dragon Gang secured his early release. On the day he got out, his combat power exceeded ten thousand, and his murderous aura was held in check. To find his missing grandmother, he accepted a secret assignment from the Earth Dragon Gang, infiltrating Baley High as an ordinary student and becoming Wang Arthur's shadow bodyguard.

While the boss of KO One was still sizing up opponents by the KO rankings, Lin Yu had pushed his combat power index to depths that made even the Guardians tremble, through countless gangland battles. Esper underworld × Ultimate High School: the humanoid beast who once tore the rules apart has returned to this world of martial arts and intrigue.

This novel and its characters are entirely fictional. Any resemblance is purely coincidental. Do not imitate.