Demon Slayer: Kimetsu no Yaiba: Season 4

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 th

Tamayo informs Yushiro of her decision to ally with the Corps. Tanjiro learns of Giyu's refusal to join Hashira Training, with Kagaya asking that he speak to him. Despite being repeatedly dismissed, Tanjiro persists. Eventually, Giyu explains his refusal to accept he is a Hashira; as a child, he trained with and befriended a similarly-aged boy, Sabito. During Final Selection, despite Sabito defeating nearly every demon present, he was the only one killed, leaving Giyu, who was unable to kill any

After recovering, Tanjiro enters Hashira Training. Reunited with Tengen Uzui and his wives, he tackles the first stage, fitness and stamina, and proves to be the most capable of everyone present. At night, as two Demon Slayers are on patrol, they are unknowingly stalked by a marked eyeball. Obanai and Sanemi discuss their encounter in the castle and the lessened demonic activity, believing it is the calm before the storm; Sanemi then challenges Obanai to a fight, which he accepts. For a special

In Muichiro's rapid movement stage, Tanjiro witnesses his strict attitude as he instructs and spars with the trainees, emphasizing perseverance even when injured. Muichiro, while acknowledging his harshness, intends for them to learn that even one mistake could be fatal in battle. Later, he spars with Sanemi and Obanai, who have taken up nightly combat training to improve their skills. Muichiro is impressed with Tanjiro's quick learning and ability to spar with him, allowing him to proceed to th

At Mitsuri's flexibility stage, Tanjiro and the trainees dance to music and stretch themselves to become more limber, with Mitsuri forcing Tanjiro into a split. At Obanai's swordsmanship stage, Tanjiro must swing a bokken between bound trainees as he spars with the Hashira. Despite the initial difficulty, as well as Obanai's dislike of Tanjiro for his closeness to Mitsuri, Tanjiro succeeds and moves to Sanemi's endurance stage, joining Zenitsu. Sanemi ruthlessly pummels him as he spars with the

At Gyomei's stage, strengthening the lower body, trainees must stand beneath a waterfall, lift three heavy logs, and push a boulder one chō to finish. Tanjiro and Zenitsu join Inosuke and fellow friend Murata. Despite completing the first two tasks, Tanjiro struggles to move the boulder. Due to the stage's difficulty, trainees choose to leave and place their hopes in Tanjiro instead. Genya reveals that moving the boulder requires Repetitive Action; a technique that involves focusing on certain m

After Tanjiro finishes training, Gyomei commends him and claims he has no doubts. Unsure of what he means, he hears Gyomei explain his past. He was a monk who cared for orphans, until a boy left his temple at night and encountered a demon, convincing it to spare him for Gyomei and the others. The demon killed the children, save for one girl, and Gyomei fought it to save her. The girl's remarks afterwards were misinterpreted and he was imprisoned, leaving him cynical and distrustful. Seeing Tanji

Kagaya reveals Muzan's role in his illness; he was a member of the Ubuyashiki bloodline and the family was cursed as a result of his crimes as a demon. Muzan disregards this and remains confident he will find Nezuko, but Kagaya assures the demon of his failure, unable to see his desire to become eternal pales in comparison to humanity's anger and will to survive. As the Hashira are summoned to the mansion, explosives level the area, killing Kagaya and most of his family and incapacitating Muzan,

Armed with his memories, Muichiro feels powerful and invincible, convinced that the demonic fifth moon has no chance against him.

Tanjiro, Nezuko, and Genya are struggling through an arduous battle against Zohakuten and his five tree dragons. They are forced to fight defensively against the tree dragons using the four emotion demon's powers, and Tanjiro is swallowed by one of them amidst the fight. Just as Tanjiro is close to meeting his demise, Mitsuri arrives in the nick of time and rescues him. And now, Mitsuri faces off against Zohakuten to rescue the captured Nezuko and Genya...!

Tanjiro continues the fight against Hantengu. Amidst all his injuries and the Superior Four's skill, will he be able to defeat him? As the battle draws to a close, the Demon Slayer Squad must race against time to end the fight before dawn.