Obanai and Sanemi's Mission [Official Demon Slayer OST] (鬼滅の刃) - Hashira Training Arc

At 0:00 the abandoned castle is introduced, setting the stage for the mission. At 1:12 the characters chase and fight demons, showcasing their skills. At 3:11 Sanemi and Obanai confront demons head‑on, highlighting their teamwork. At 5:49 the Infinity Castle is revealed, adding a new element to the story.