Over the next year and a half, Tanjiro trains with Urokodaki, improving his physical form and learning how to use a special breathing technique Total Concentration, to accelerate his stamina and speed. One day, Urokodaki declares that if Tanjiro can slice a boulder with his sword he will let him enter Final Selection — a survival test administered by the Demon Slayer Corps that will determine who can become a demon hunter. Tanjiro tries for the next 6 months, failing each time, while Nezuko continues to sleep...