Demon Slayer is an animated TV series based on manga. I've been seeing this in Netflix suggestion after I have finished Attack on Titan Season 4 and after the movie was just released in 2020.
I've finished Season 1, Kimetsu no Yaiba in just 2 days of watching. The season has 26 episodes, with each, a 20-minutes long.
The story revolves around the main protagonist named Tajiro, and his quest to search for a cure for his sister who transformed into a demon. Along his journey, his demon sister is always with him, caged inside a box that was created by his master, Urodaki, who trained and teaches Tajiro to fight, in preparation to join Demon Slayer Corps. He met Zenitsu, a blond-hair guy the same age as him, and was also in the same Final Selection before joining the Demon Slayer Corps. He also met Inouke, a guy wearing a boar-headed mask, who was also in the same Final Selection. The three immediately became friends and were part of the group in solving missions. It makes the anime series fun, with different personalities and characters. The whole season is filled with action fight scenes and full of emotions.