From the Start, I Play Muzan and Assemble the Twelve Kizuki!

Su Ye is brutally beaten by his wealthy classmates, who break his arms and legs and throw him into a restricted zone overrun with ferocious beasts to die. At death’s door, he awakens the [Myriad Worlds Villain Roleplaying System]. By playing a villain, he can gain all their abilities, and the more chaos and fear he causes, the faster his power grows.

From the start, he takes on the role of the final boss of Demon Slayer, Muzan Kibutsuji. Su Ye gains an immortal body and the ability to create demons. He turns the beasts hunting him into his first batch of “demons” and easily kills them in return. Back in the city, he transforms the classmates who once betrayed him and the enemies who bullied him into his most loyal Lower Rank demons. He appears to be an ordinary student, but in the shadows of the city, he builds the fearsome organization known as the “Twelve Kizuki.”

His Upper Rank One is a former martial arts alliance leader, while his Upper Rank Two is the gorgeous campus belle… Everyone thinks a new terrorist organization has appeared in the city, never realizing that Su Ye is the one pulling its strings. As his roleplaying mastery grows, he unlocks even more powerful villains: Sosuke Aizen, whose Kyoka Suigetsu turns the world upside down, and Madara Uchiha, whose Tengai Shinsei flattens cities. The so-called righteous alliance and the world government alike must bow before his throne.