I Became a Demon Sword and Traveled the Anime Worlds

Thrown across time by a stroke of absurd luck, Alex awakens in the world of Demon Slayer and unlocks the Strongest Demon Sword System. There is just one problem. He is no longer human. Forced to become a demon sword, Alex can only grow stronger by harvesting emotional value. The greater the emotions he provokes, the more power he gains—until even the abilities of countless worlds can become his. At the very beginning, he draws a legendary blade template and becomes Asuramaru. From that moment on, everything changes. “Tanjiro,” Alex whispers, “go take your revenge. Release every desire in your heart.” Tanjiro gains a sword unlike any other. Muzan Kibutsuji gains a nightmare he cannot escape. “Don’t come any closer!” As Alex travels from world to world, the powers he can draw become more and more outrageous: Chidori. One Sword Style: Asura. Demonic Sword Thousand Blades. Flying Thunder God. Bankai. Domain Expansion. Unlimited Blade techniques... If it can be imagined, it might appear in his hands. And so, across the heavens and countless worlds, a new legend begins— the legend of the strongest demon sword. — Description from novelcodex.org