To Defeat Muzan Kibutsuji (S05E01)

Title: Confronting Muzan Kibutsuji Plot: The Hashira, including Sanemi and Iguro, embark on a mission to a desolate castle perched on a mountain, while Tanjiro recuperates at the Butterfly Mansion after his injuries from the Swordsmith Village. Soon after, the Hashira convene at the Ubuyashiki Mansion for an important meeting, where Muichiro shares the origins of the marks. To bolster the Demon Slayer Corps from the ground up, they initiate a rigorous training program for the Hashira, aiming to enhance their collective strength against Muzan Kibutsuji.