On his quest to avenge his family and find a way to save his younger sister Nezuko, Demon Slayer's main protagonist Tanjiro Kamado grows stronger with every story arc. Considering everything he's faced, from the brutal murder of his entire family to fighting anyone who would try to kill his demon sister before he can find a way to cure her, Tanjiro has had no choice but to home his prodigious skills. Whether that strength is enough to keep him alive and slaying demons until the last one has been destroyed is yet to be determined onscreen, but for those itching to find out how Tanjiro fares in the end, the manga has all the answers.
Source：https://www.cbr.com/demon-slayer-does-tanjiro-become-demon/
