The Demon Slayer anime has quickly established itself as a modern shonen classic due to several reasons. It has stellar animation, a strong emotional core, and best of all, ample plot twists and shocking moments to keep viewers on their toes. Demon Slayer's plot and premise feel largely conventional, but those twists help keep things fresh from one episode to another.
Source：https://www.cbr.com/demon-slayer-shocking-moments/
