Kimetsu no Yaiba: Gaiden

Giyu heads north to an area where a band of hunters was killed. He and the Insect Hashira meet Yae, the daughter of a slain hunter, who believes a bear killed her father, but the truth is harder to face. Kyojuro also receives his newest assignment and hopes completing it will prove he’s worthy of the title Flame Hashira, which his father abandoned. An explosive battle unfolds as Kyojuro takes on a demon of the Twelve Kizuki who holds a grudge against Kyojuro’s father.
(Source: Viz Media)
Note: the chapter count is 30 because it includes Kimetsu no Aima, which was originally 26 chapters.