This filter was inspired by Akaza (Jyougen no 3) from the anime Demon Slayer (Kimetsu no Yaiba).
Demon Slayer (Kimetsu no Yaiba)
A family is attacked by demons and only two members survive - Tanjiro and his sister Nezuko, who is turning into a demon slowly. Tanjiro sets out to become a demon slayer to avenge his family and cure his sister.