Recaps

Lin Yoriichi protected the Kamado family, joined the Demon Slayer Corps, and confronted Muzan Kibutsuji’s forces while searching for Yoriichi Tsugikuni’s grave. After wounding Kokushibo and driving Muzan into hiding, Lin returned to Headquarters to propose training the Hashira to use bright red Nichirin swords.

• Lin Yoriichi used his Yoriichi Tsugikuni cosplay abilities to frighten Muzan Kibutsuji away from the Kamado home, then helped the family as Giyu Tomioka and Momoki Haruko arrived.
• Lin Yoriichi joined Giyu Tomioka and Murata on patrol, killed a demon with Sun Breathing, and revealed his strength to the Hashira and Kagaya Ubuyashiki at Headquarters.
• Kagaya Ubuyashiki assigned Lin Yoriichi to travel to Asakusa with Kyojuro Rengoku, while Sanemi Shinazugawa joined them after Lin bested him in a brief fight.
• Lin Yoriichi, Kyojuro Rengoku, and Sanemi Shinazugawa pursued and killed Byōyō and Kamanué, then Lin met Miss Tamayo, who revealed where Yoriichi Tsugikuni was buried.
• Lin Yoriichi learned about Yoriichi Tsugikuni’s grave from Miss Tamayo, sent her blood samples for research, and later fought demons alongside the other swordsmen.
• After finding Yoriichi Tsugikuni’s grave, Lin Yoriichi faced Kokushibo, called him his elder brother, and wounded his neck with a bright red Nichirin Sword.
• Kokushibo fled from Lin Yoriichi, while Muzan Kibutsuji panicked and decided to seek the Blue Spider Lily and search for Demon Slayer Corps bases.
• Lin Yoriichi returned to Headquarters and proposed that Kagaya Ubuyashiki help train the Hashira to use bright red Nichirin swords.

Lin Yoriichi guided Giyu Tomioka through Final Selection, killed Enmu, and helped Kyojuro Rengoku fight Akaza before the demon escaped. After Lin defeated Gyokko and began training the Hashira, Rui was promoted and trapped Murata on Mount Natagumo, where several Hashira and Yoriichi confronted him.

• Kagaya Ubuyashiki gave Lin Yoriichi a Disaster-Averting Mask, and Lin met the Kamado family at the Butterfly Mansion, where they thanked him for saving them because of a promise to Tanjiro’s ancestor.
• Lin took Giyu Tomioka to Mount Fujikasane, where Giyu killed the Hand Demon and developed Water Breathing’s Twelfth Form, then returned to Headquarters with orders to investigate a train.
• Lin and Kyojuro Rengoku confronted Enmu on the train, and Lin tracked down and killed Enmu’s real body before Akaza arrived and fought them.
• Muzan Kibutsuji controlled Akaza as he fought Lin and Rengoku, but Akaza escaped into the Infinity Castle after Lin killed several Hantengu clones and sent Yushiro a blood sample to investigate its location.
• Kagaya Ubuyashiki gathered the Hashira at the Swordsmith Village, where Gyokko attacked them and Lin later beheaded him before he could harm Kotetsu.
• Lin showed the Hashira how to make their Nichirin swords bright red and began teaching them the Transparent World, while Muzan promoted Rui to Upper Rank Six and sent Rokuro and Koyuki to Mount Natagumo.
• Rui captured Murata on Mount Natagumo, but Sanemi Shinazugawa, Giyu Tomioka, and Shinobu Kocho intervened, and Rui fled toward the Infinity Castle, and Yoriichi blocked his path.

Lin Yoriichi obtained medicine from Miss Tamayo and helped eliminate several Upper Rank demons before joining Kagaya Ubuyashiki's false Blue Spider Lily discovery scheme. The operation led to Doma's death and Akaza's recovered memories, while Kokushibo delivered a withered flower to Muzan Kibutsuji.

• Miss Tamayo gave Lin Yoriichi experimental medicine for his Demon Slayer Mark, and he killed Hantengu outside her hideout.
• Lin Yoriichi killed Daki and Gyutaro with Giyu Tomioka and Tengen Uzui present, then discovered that Miss Tamayo's medicine restored the demons' human memories.
• Kagaya Ubuyashiki publicized a false Blue Spider Lily discovery, and Shinobu Kocho infiltrated the Eternal Paradise Cult after its followers visited the exhibition.
• Lin Yoriichi and Shinobu Kocho killed Doma, and Lin Yoriichi questioned him about the Infinity Castle, Kokushibo, and Akaza.
• Akaza killed Kaigaku after Kaigaku offered to poison Demon Slayer Corps swordsmen, and Lin Yoriichi later reunited Gyomei Himejima with Sayo.
• Muzan Kibutsuji staged demon attacks to distract Lin Yoriichi while Kokushibo took over retrieving the Blue Spider Lily from Akaza.
• Kyojuro Rengoku awakened his Demon Slayer Mark while fighting Akaza, and Lin Yoriichi's medicine helped Akaza remember Koyuki and his human name, Hakuji.
• Hakuji described the Infinity Castle and chose to await sunlight with Koyuki, while Muzan Kibutsuji examined the withered flower Kokushibo had brought him.

Lin Yoriichi helped restore Shinjuro Rengoku’s resolve, explored ancestral memories, and joined the Hashira against Kokushibo before pursuing Muzan Kibutsuji into the Infinity Castle. Muzan escaped repeated attacks by sacrificing Nakime, only to encounter a Hashira ambush at the pharmaceutical tycoon’s home.

• Lin Yoriichi persuaded Shinjuro Rengoku to stop wallowing and learned that Miss Tamayo could make a drug for entering other people’s dreams.
• All nine Hashira assembled to defend the Butterfly Mansion against Kokushibo, and Lin Yoriichi intercepted his retreat and entered his memories before his death.
• Muzan Kibutsuji discovered that the reported Blue Spider Lily had been an ordinary white spider lily stained with blue pigment.
• Lin Yoriichi entered Muichiro Tokito’s and Kyojuro Rengoku’s dreams, witnessed Yoriichi Tsugikuni’s past, and raised his restoration rate to 88%.
• Tanjiro Kamado revealed real Blue Spider Lilies on Mount Kumotori, and Sakonji Urokodaki attacked the demon Muzan Kibutsuji sent to collect them.
• Lin Yoriichi followed Muzan Kibutsuji through the passage into the Infinity Castle and worked with Yushiro to seize control of Nakime and repeatedly slash Muzan.
• Muzan Kibutsuji reduced himself to a finger-sized form, killed Nakime, and stole her biwa to separate Yoriichi Tsugikuni and Yushiro.
• Muzan Kibutsuji fled to the pharmaceutical tycoon’s home, where Kyojuro Rengoku attacked him and he realized the Hashira had gathered to ambush him.