The Jungdogdoegi Jeon-ui Nabi

Korean for the Butterfly before Poisoning.

Shinobu Kocho was devastated by the loss of her entire family and all her friends. When she met Mitsuri Kanroji, the cheerful girl brought some hope and happiness into her world. But will she be able to protect her sisters or just one of them?

Giyu Tomioka lost his sister and his parents to demons. He almost lost his bestfriends Sabito and Makomo to the Hand demon at the Final selection if it wasn't for Shinobu Kocho and Mitsuri Kanroji. As he continues to grow and become even better than Sabito and Makomo, he realizes that the girl that he owes everything to needs his help now.

Water can bring healing and life, but can it cure the poisoned butterfly?

Credits to the owners of the demonslayer manga and of the anime.

I would be okay with a repost as long as I am informed beforehand, and credited.