This is a 10 hour repeat of the song "Fragrance of Dark Coffee" from the "Gyakuten meets Jazz Soul" album. This song was arranged by Noriyuki Iwadare and performed by the Metamorphosis Jazz Band.
For some people, the rain might be too loud. I experienced this when I listened to this on my phone. Try setting the video to a higher quality, or listening though better quality speakers. If too many people complain, I'll play around and see if I can upload a "fixed" version.
I haven't seen a 10 hour version of this on Youtube. So I decided to make it myself.