Kimetsu no Yaiba

A Japanese Manga series that ran from 2016 to 2020. It's written and illustrated by the Mangaka Koyoharu Gotouge (born 1989). The series follows the story of Tanjiro Kamado who has taken it upon himself to support his mother and five siblings. One day when Tanjiro finds his family slaughtered and the lone survivor, his sister Nezuko Kamado, turned into a demon. A demon hunter named Giyu Tomioka arrives and tries to finish Nezuko off, but to his surprise she and Tanjiro start to protect one other. Seeing this oddity and Tanjiro's promising fighting skills, Giyu sends them to his old mentor to be trained. Thus begins the story of Tanjiro's life as a demon hunter, bound on a quest to cure his sister and defeat the one who murdered his family. Kimetsu no Yaiba is a short manga with 205 chapters that only a few loyal fans payed attention to at the start of its serialization in 2016. Only in the summer of 2018, did it started publishing in the west under the name, Demon Slayer: Kimetsu no Yaiba. Outside of Japan, most people still didn't pay attention to it and wrote it off as a generic shonen series, with the manga selling a decent 2 million copies. Until the studio Ufotable gave it an anime in 2019, only then did it start to take off, trending on social media and skyrocketing the manga sales to 150 million copies, with people's opinions of the series shifting dramatically, overnight all because of one episode.