Demon Slayer Peak Blade

(New breathing method + invincibility + no regrets + no female protagonist and multiple female supporting roles) Isshin, the king who had fallen from the sky and chased him at home, felt his eyes go dark. When he opened his eyes again, he found that he had become an abandoned baby. In his mind, there was a skill that a samurai named Ashina Isshin had honed throughout his life. In the process of gradually growing up, Isshin gradually realized that he was in the world of Demon Slayer: Kimetsu no Yaiba. Facing this new world full of challenges and opportunities, Ishin decided to rely on Wei Mingren's superb swordsmanship to embark on a legendary journey in pursuit of the strongest blade!