Demon Slayer: I Became the System Itself

When Lin Chuan's system crashes on arrival in the Demon Slayer world, he absorbs its power and becomes something unprecedented—a fusion of the legendary Yoriichi Tsugikuni and the Demon King Muzan himself. Caught between human warmth and demonic might, he vows to protect his found family while rewriting the rules of this blood-soaked world. Nezuko sees him as her guardian, Tanjiro discovers his secret identity as a Hashira, and even Muzan trembles before this impossible existence. But when Shinobu claims him as hers and ancient demons question his terrifying strength, Lin Chuan must decide: wi…