Kimetsu no Yaiba Novelization 9

Demon Slayer Novelization: Final Battle and Nezuko's Awakening Arc (鬼滅の刃 ノベライズ ～最終決戦と禰豆子の目覚め編～), written by Makimi Hano, is the ninth light novel based on the Kimetsu no Yaiba manga. The illustrations are created by Koyoharu Gotoge.

Synopsis
The Demon Slayer Corps has settled the score with the Upper Rank demons in the Infinity Castle, the base of Muzan. However, within the depths of the castle, Muzan begins to stir, and finally confronts Tanjiro and the others! Meanwhile, the past of Obanai, who secretly has feelings for Mitsuri, will also be revealed...!?