Sleepy
When I went there at night I always felt sadness from being there but also happy and sleepy as well as I recruited more and more digimon to the city to help out and help restore the world as well. Very calming and nice piece I think, reminds me of how much fun I had playing this game as a kid, fun times indeed.
The xylophone seems to lull you to sleep and help you realize that you are always welcome and safe in File City as well. The synth in the background gives an ambient feel and also kind of makes you feel sad as well.
Overall, wonderful remake, wonderful times, wonderful memories.