My System Reborn Me As My Waifu in Demon Slayer

Lin Yu's life ended in a flash, only to be dragged into a cruel game by a mysterious System: survive the demon-infested world of Demon Slayer, or face eternal oblivion. Resurrection was the prize, but the challenges were brutal, starting with his very identity. The System cursed him with his own online avatar – a beautiful, white-haired girl named An. Stripped of her unique 'transformation' ability, he was just an ordinary girl in a world where flesh-eating demons lurked in every shadow. How could a former man, now vulnerable and physically weak, hope to join the elite Demon Slayer Corps and survive? Thankfully, the System also granted him rapid growth and unique insights, turning every grueling battle into accelerated power. As he masters powerful breathing techniques and slices through hordes of monstrous threats alongside unexpected allies, Lin Yu discovers the true horror: not all demons are mindless beasts. Some, like the unsettling 'Long-Tongued Ghost,' seem to possess forbidden knowledge, hinting that this isn't just a game, but a twisted reality where even fate itself can be defied. Can he unravel the world's secrets before he becomes another demon's meal, or worse, succumbs to the game's ultimate, horrifying price?