NeedHelpPleaseHelp

Hello! I need help finding a manga I don't remember the name too. It's a swordsman style manga that takes place in an older era (not certain which). The main character is a young boy with black hair in a ponytail. He is first seen surrounded by what looks like other swordsmen and survivors under a homeless/rescue shelter to defend from what's going on around them (there seems to be monsters, demons attacking their world, one of whick killed his family, his sister I believe, and he survived by running away). The boy is traveling, not sure where or for why, and later encounters another boy seemingly around his age. This boy has short blue hair from what I can remember and a traditional cone straw hat. He is a priest of some sort who begins to travel with the swordsman boy. Some of the places they go to are rather desolate, the first one I can remember is a village that appeared to be pillaged by the monsters. Sadly this is all I can remember and without the characters names or title I haven't found much. If anyone knows a manga or two that rings a bell I'd be very grateful if you could help me find it.