Recaps

Teiichi joined the Hashira Battles, then took Muichiro as his disciple and guided him through training and Final Selection until he developed Mist Breathing. In Kazami Town, Muichiro and Teiichi uncovered the truth about the linked Lower Rank Six demons, and the brothers turned on each other as the confrontation continued.

• Gyomei Himejima stopped Sanemi Shinazugawa from confronting Teiichi and invited Teiichi to the Hashira Battles, where Teiichi defeated Sanemi and later sparred with the other Hashira.
• Kagaya Ubuyashiki asked Teiichi to train Muichiro Tokito, and Teiichi accepted after learning about Muichiro and Yuichiro Tokito’s past.
• Teiichi trained Muichiro in Wind Breathing, then helped him develop Mist Breathing by observing clouds and changing his breathing rhythm.
• During Final Selection, Muichiro protected Aoi Kanzaki while she fought demons, then rescued her from a powerful demon and beheaded it.
• Kanae Kocho and Teiichi visited Sakonji Urokodaki to see Nezuko and collect a sample of her blood, while Aoi chose to work at the Butterfly Mansion rather than fight demons.
• Muichiro went to Kazami Town to investigate disappearances, defeated a demon he believed was Lower Rank Six, and later discovered that the demon had survived through his twin, Jiro.
• Teiichi captured Taro and learned that he and Jiro were conjoined twins transformed into demons by Muzan Kibutsuji, with each able to regenerate from the other.
• Teiichi brought Taro to Muichiro and Jiro, ordered Muichiro to disable Jiro without beheading him, and led the brothers out of town, and Jiro then attacked and began devouring Taro.

Teiichi trained Muichiro and advised Tanjiro about Nezuko before Tanjiro, Zenitsu, and Inosuke faced the demons controlling the mountain. The mission ended with Tanjiro confronting Rui and Kanon arriving to help Inosuke against the Spider Father.

• Muichiro defeated Lower Rank Six with Mist Breathing, while Teiichi kept the demon bound until sunrise and Muzan later ordered the Upper Ranks to find Teiichi.
• Muichiro completed his apprenticeship under Teiichi and began training with Tengen, while Teiichi met Tanjiro and warned him that many Corps members would reject Nezuko.
• Tanjiro killed a demon with Teiichi’s guidance, and Tengen took Inosuke as his Tsuguko and sent him on a mission.
• Tanjiro met Zenitsu, and the two joined Inosuke in fighting demons inside a shifting house before they regrouped at a Wisteria House.
• Tanjiro and Inosuke freed Corps members controlled by the Spider Mother and killed her, while Zenitsu defeated Spider Demon Brother despite being poisoned.
• Tanjiro and Inosuke fought Spider Father, while Tanjiro faced Rui and Nezuko shielded him from the demon’s threads.
• Tanjiro used Hinokami Kagura against Rui, who revealed he had severed his own head and took Tanjiro’s sword.
• Kobayashi Kanon arrived as reinforcement, cut through Spider Father’s defenses, and drew Inosuke’s challenge to a duel.

Tanjiro and Nezuko were accepted by the Demon Slayer Corps, but their journey aboard the Mugen Train led Akaza to learn Teiichi’s location. Teiichi faced six Upper Ranks at Cape Ashizuri, where Gyomei joined the battle and killed Sekido as Doma summoned a giant Bodhisattva.

• Giyu stopped Shinobu from killing Nezuko, and the Hashira later voted to accept her after Tanjiro and Kagaya defended her.
• Tanjiro, Zenitsu, and Inosuke boarded the Mugen Train, where Enmu’s attack put them to sleep before they defeated him and saved every passenger.
• Akaza confronted Kyojuro after the train crashed, wounded him, and pressed Tanjiro to reveal Teiichi’s location.
• Tanjiro told Akaza that Teiichi was at Cape Ashizuri, and Teiichi soon confronted Kokushibo, Akaza, Doma, Hantengu, Gyokko, and Daki there.
• Teiichi battled the Upper Ranks with Wind Field, targeting Doma while the other demons tried to hinder him with lightning, slime-fish, and sashes.
• Gyomei arrived to support Teiichi and was ordered to hold off Hantengu’s group while Teiichi fought the strongest demons.
• Gyomei awakened his perception, killed Sekido with Stone Breathing, and forced Gyokko to escape into his pot.
• Doma summoned his enormous Water Lily Bodhisattva, and Teiichi raised his blade to face its fist.

Teiichi survived a battle against six Upper Ranks by filling the Infinity Castle with Wind Blades, killing Gyokko and Hantengu before Muzan teleported him away. After recovering, he briefed the Hashira, helped establish new training plans, and began training Inosuke.

• Teiichi fought the Upper Ranks inside the Infinity Castle, eventually creating Wind Blades that damaged the castle and defeated Gyokko and Hantengu.
• Muzan had Nakime teleport Teiichi out of the castle, and Kanae found him alive and embraced him.
• Teiichi recovered at the Butterfly Mansion, forgave Tanjiro for revealing his location, and learned that Kyojuro had been badly injured by Akaza.
• Teiichi explained his escape and the deaths of Upper Ranks Four and Five, then considered how Muzan might learn that Nezuko could withstand sunlight.
• Kagaya gathered the Hashira, and Teiichi described the Upper Ranks’ strength and techniques as the Corps discussed the fall in demon appearances.
• The Hashira held battles to rank their combat abilities, with Giyu defeating Sanemi, while Teiichi agreed to train Inosuke.
• Teiichi and Kanae visited Kazeno Shoma’s grave, where Teiichi promised to end Muzan’s threat.
• Back at the Butterfly Mansion, Teiichi accepted Inosuke’s duel, evaded his attacks, and pointed out a blind spot before Inosuke prepared to use Boar Blast.