Black Sun, Silver Moon by Tomo Maeda is about a boy named Taki Juhas (Does the name sound vaguely familiar? like Judas from the Bible.) Anyways this boy as the oldest of ten has the responsiblity of paying off family debts by cleaning for the Church. There he finds that he’s not just cleaning with brooms and mops. There is something more sinister that needs to be cleaned, namely zombies and he is to do this with the help of the priest, Shikimi. And of course things happen all along the way that get in the way of removing these zombies.
Here’s page two of my fan manga.