Amazing Story and Quality
Mushi-shi may not have been the first anime I have watched but it is definitely the best, I see that CR only have season 2 uploaded however I highly recommend watching season 1 as well.
The story is heart touching and every story however unrelated to the next episode contributes in every way, some parts make you laugh, some cry, but none feel out of place or poorly made, this is the way an anime should be made.