Rate my manga story for me please?

So i have this anime story in mind. It isn't complete, but it is just an idea. The story takes place in europe, probably the 1700s, or earlier. Maybe the midievil days. But i want them to have things like modern revolvers instead of musket guns, toiletries like toothpaste, and stuff like that, but i still want the midievil feel to it with a modern touch. The story will be about a small town regularly attacked by monsters. Werewolves, vampires, zombies, etc. So, a group of fighters is started by the church to protect everyone. I dont want the story to only focus on the town defending itself, but i also want some sort of epic quest. Like part of the group travels across the land to get to the magicians castle to kill him or something along those lines. I also had a crazy idea in my mind that one of the characters, possibly the main character is a time traveler, and hes apart of the same group but in modern day and travels back in time to help them. On his journey he meets a young woman whom he falls in love with and is saddened that he needs to leave her when he goes back to his own time. So he takes her back with him or something. I dont know, for right now im just trying to put ideas together and make them work.