Demon Slayer: Kimetsu no Yaiba (2019)

S1E25 Tsuguko, Kanao Tsuyuri

While recuperating at the Butterfly Mansion, Tanjiro dedicates himself to mastering Total Concentration Breathing techniques. Initially, he struggles against Kanao, the skilled swordswoman assigned to train him, but gradually he starts to improve. Inspired by Tanjiro's relentless commitment to his training, Zenitsu and Inosuke decide to jump back into their own training routines. However, challenges still lie ahead for them all as they push their limits.