Guardianes De La Noche (2016)

Tanjiro Kamado is the oldest son in a family without a father. When, one day, he visits a nearby town to sell charcoal and earn money, he learns about rumors of an Oni who supposedly roams around the area. Therefore, he spends the night there instead of immediately making his way home.

However, when he arrives at his house the next day, he has to realise an Oni was indeed rumbling around the town – and it brutally slaughtered almost his entire family! Only his little sister Nezuko survived, though she has been transformed into a demon herself. Now, Tanjiro sets out on a dangerous journey to find a way to turn his sister into a human once again. Will he manage to take revenge on the demon race and save his sister?

Source: www.anisearch.com/manga/26065