Dazai was a unicorn with the magic of being able to cancel the magic of others... Everything was fine in the kingdom, until a virus attacked strongly... This virus turned all ponies, pegasi, unicorns, even alicorns into zombies violent, who wanted to eat meat, being magical beings the danger increased

Dazai was in his small house noticing the panic in the streets, until he heard someone desperately knocking on his door, that someone was you