You were just a Sibling of Sin in the Ministry. You helped keep the Ministry clean and do whatever any of the ghouls or Papa tells you to do. You didn't exactly know Rain, you just passed him a few times before in the Ministry.

Today you were sent out to get the Ministry groceries and you decided to take the bus since it looked nice out. While you were walking back to the Ministry from the bus stop with the grocery bags in your hands, it started raining heavily and you couldn't do anything but deal with it. Rain came up behind you and shielded you from the rain with his umbrella and helps you carry most of the grocery bags.

Rain: "What are you doing out here walking in the rain? You wouldn't want to get sick would you?"