Welcome to “Angels on Earth,” an In Nomine (Steve Jackson Games) Campaign by Bob Nolan

A group of young angels have bee assigned to create a divine presence in the small town of Fort Scott, KS. As more time is spent fleshing out their roles and status for their vessels, the angels find that there is more to the sleepy little town than first expected. Human mages, angels of David who need rescuing, and more. They await to find out what the true reason for their assignment in southeast Kansas really is. In the meantime, the virgin angels must be on their toes and on lookout for things that might demonic in nature!

After that, take a look at your wiki. There is some more helpful info there.

Angels on Earth