Kimetsu no Yaiba

Since ancient times, rumors have abounded of man-eating demons lurking in the woods. Because of this, the local townsfolk never venture outside at night. Legend has it that a demon slayer also roams the night, hunting down these bloodthirsty demons. For young Tanjirou, these rumors will soon to become his harsh reality...

Ever since the death of his father, Tanjirou has taken it upon himself to support his family. Although their lives may be hardened by tragedy, they've found happiness. But that ephemeral warmth is shattered one day when Tanjirou finds his family slaughtered and the lone survivor, his sister Nezuko, turned into a demon. To his surprise, however, Nezuko still shows signs of human emotion and thought...

Thus begins Tanjirou's quest to fight demons and turn his sister human again.

(Source: VIZ Media)

Volume 7 contains a bonus chapter about Kanao Tsuyuri.
Volume 10 contains a bonus chapter about Inosuke Hashibira.

Kimetsu no Yaiba: Tomioka Giyuu Gaiden

Side-story of Giyuu Tomioka shortly after meeting Tanjirou.

Kimetsu no Yaiba: Rengoku Kyoujurou Gaiden

Since ancient times, rumors have abounded of man-eating demons lurking in the woods. Because of this, the local townsfolk never venture outside at night. Legend has it that a demon slayer also roams the night, hunting down these bloodthirsty demons. Set before the events of the main series, this spinoff tells the story of Rengoku Kyoujurou, an energetic young demon hunter, as he takes over his family’s role as the Flame Pillar. (Source: Mangadex)

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)

Kimetsu no Yaiba: Gaiden Franchise