What is the relationship between Demon Slayer manga volume 3 and the anime adaptation?

Demon Slayer manga volume 3 corresponds to a significant portion of the first season of the anime adaptation, specifically covering episodes 15 through 20. This includes the entirety of the Mount Natagumo Arc's climax and the initial segments of the Hashira Meeting and Rehabilitation Training Arc, faithfully adapting the manga's events and character introductions.