Demon Slayer: Kimetsu no Yaiba Hashira Training Arc Episode 1 English Dubbed Episode Title: To Defeat Muzan Kibutsuji Episode Description: While on a mission to rescue a kidnapped woman from a demon, Wind Hashira Sanemi Shinazugawa and Serpent Hashira Obanai Iguro encounter an entrance to the Infinity Castle before it vanishes. In an emergency meeting led by Kagaya's wife Amane, the Hashira discuss the marks that appeared on Mitsuri and Muichiro in their battles, said to have originated from the Demon Slayers during the Sengoku period. Muichiro gives details of the physical conditions he felt that may allow the mark to appear on the others. Knowing that Muzan Kibutsuji will attempt to take Nezuko, the Corps enacts Hashira Training for its personnel to condition them for the coming conflict. Each Hashira will lead a training regimen to strengthen the Demon Slayers. However, Water Hashira Giyu Tomioka refuses to participate. Whilst in hiding, Tamayo is visited by Kagaya's Kasugai crow, who instructs her to ally with the Corps and work with Shinobu Kocho.