Demon Slayer: Kimetsu no Yaiba

The setting is Taisho era Japan. Tanjirou is a kindhearted young boy who lived peacefully with his family as a coal seller. Their normal life changes completely when his family is slaughtered by demons. The only other survivor, Tanjirou's younger sister Nezuko, has become a ferocious demon. In order to return Nezuko to normal and get revenge on the demon that killed their family, the two of them depart on a journey. From a young talent, an adventure tale of blood and swords begins! 

(Source: Shonen Jump) 

*Notes:
\- Includes two extra chapters.
\- Nominated to the 24th and 25th Annual Tezuka Osamu Cultural Prize.*

Tanjirou, along with Zenitsu, Inosuke, Nezuko, arrives at their next mission's destination, the Mugen Train, where over 40 individuals have vanished within a brief span of time. Teaming up with Kyoujurou, the Flame Hashira, Tanjirou confronts the hidden demon lurking within the train. However, what awaits them is an endless dream...!?

(Source: Shueisha, translated)