Two years have passed since Nezuko's transformation, and Tanjiro leaves for the Final Selection. Before his departure, Urokodaki warns him that a demon's strength is equivalent to the number of humans it has eaten, gifting him a fox mask with a protection spell. Tanjiro reaches Mt. Fujikasane, where wisteria flowers bloom year-round, creating a prison for demons, and is informed that to pass the test, the applicants must survive there for 7 days. During his first night, Tanjiro makes use of his training to defeat all the demons he encounters, until he and another applicant come face-to-face with a huge mutated demon made out of ghastly hands...