Demon Slayer- Kimetsu No Yaiba - Infinity Castle -
Throughout the arc, the protagonists face numerous challenges and adversaries within the castle walls, including powerful demons and Muzan's elite warriors, the Twelve Kizuki. The Infinity Castle serves as a catalyst for Tanjiro's growth and development as a demon slayer, as he confronts the darkness within himself and the true nature of the world he lives in.