Demon Slayer: The Dragon-Elephant Swordmaster

My name is Takeo Kamado, and I don't know how many sons my family has had. My older brother is Tanjiro Kamado, my older sister is Nezuko Kamado, and my father is Tanjuro. Now I'm faced with a life-or-death dilemma. Muzan Kibutsuji is already at our front door. What should I do? Can I protect my family? [The protagonist is reborn into the Kamado family. During the process, he sees a stone wall inscribed with the Dragon-Elephant Prajnaparamita Skill. After training furiously, he punches Doma and kicks Muzan.]