I'm always hard pressed to pick a number, but I liked it.
I like stories that bring the ridiculous and mundane together, and the protagonist here struck me as immediately likable with room to grow. The art's nice, though the second devil was far less interesting looking than the first one, and I like the double hook (boy saves monster, monster saves boy by becoming him; boy leaves one form of servitude for another) and girls in suits.
My main worry is whether or not the fights will just be visceral splash pages or actually have some thought/planning/tension to them. I could easily see this comic try to walk the Hellsing line where Alucard just kills everything in a flashy way, but without the stuff that makes Hellsing work in spite of that.
Will read more, but will expect it to go somewhere from here.