Demon Slayer: Kimetsu No Yaiba, Vol. 21: Ancient Memories

"The fight with Kokushibo, the highest-ranking demon among Muzan's servants, is over. Although Himejima and Sanemi defeated Kokushibo and sent him to hell, the price the Demon Slayer Corps has paid is very high. Kiriya Ubuyashiki, the new leader of the Demon Slayers, struggles to recover from the losses. With the battle against Muzan far from over, the remaining fighters will need his help more than ever. Meanwhile, deep within Infinity Castle, Tanjiro and his friends come face-to-face with their nemesis at last..."--