Arc 1Yoriichi’s Return
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.