Demon Slayer aka Kimetsu No Yaiba is not just an Anime, it is an emotion. It has action, comedy, tragedy and lot of life lessons to learn. Watch this if you want to get motivated as it has only 21 episodes for S1.
If you can do one thing, hone it to perfection. Hone it to the utmost limit.
-Jigoro Kuwajima, Thunder Hashira