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: Katahane no Chou

The second light novel written by Aya Yajima for Kimetsu no Yaiba containing six stories.

1. Katahane no Chō
The story of how the Kouchou sisters ended up becoming Demon Slayers.
2. Tadashii Onsen no Susume
Uzui motivates Zenitsu to complete his training by offering him the chance to join a mixed-gender bath. Excited, Zenitsu agrees, roping in Inosuke to help him finish the task.
3. Kanroji Mitsuri no Kakushigoto
Mitsuri begins to feel troubled after learning about the reason why Shinobu joined the Demon Slayer Corps. Feeling selfish, she begins to avoid the other Hashiras. Obanai and Shinobu, not knowing what's wrong, brainstorm ways to cheer her up.
4. Yume no Atosaki
Genya enjoys a quiet day in the Butterfly estate amidst thoughts of his older brother.
5. Warawanai Kimihe
The pillars get together to make Tomioka laugh.
6. Chūkōikan ☆ Kimetsu Gakuen Monokatari ~ Paradaisu・Rosuto
A cute short about the Kimetsu no Yaiba cast as modern-day students preparing for the upcoming school festival.

(Souce: Anilist)

Kimetsu no Yaiba: Katahane no Chou Franchise