Shi Qiang, a shut-in from Earth, transmigrates into One-Punch Man as Flashy Flash.
Before he can even get used to his new body, he's assigned an SSS-rank mission to escort the “Space-Time Cube.” The cube goes berserk and tears open space, dragging him and his sword into Demon Slayer.
Killing demons makes him stronger and lets him break through his limiter. He never needs a second strike to slay a demon. When Muzan Kibutsuji sees him, he trembles in fear. This guy is even scarier than Yoriichi Tsugikuni! There's no way to beat him, absolutely no way!
He takes Akaza as his disciple through sheer strength and forms a bond with Kanae. Taking his disciple Akaza along, he tears through space with Kanae and enters Spirit Cage, cutting down hordes of monsters along the way. The protagonist, Mark, is no match for him and can only stand aside. What? The Abyssal Armor? Isn't that made especially for my immortal disciple Akaza? This is so exhilarating, so epic!!!
To be honest, the plot is pretty good but many of the settings have nothing to do with the original work. It's the same timeline as Tanjiro but the settings are not aligned with the original timeline. Some settings were changed without explaining why. To do this, it would be better to open a separate timeline and start from the timeline before Kanae.
We are all brothers, so what are you talking about?
The content is very exciting. The first part is average. The more you read later, the more you get hooked. The more you read, the more you like it. Give it a try.