I just picked up Mushi-Shi on a whim. It's got a great, chill vibe to it. The music is haunting, the slow pace is perfect, and I think Ginko's VA does a fantastic job of breathing life into his character. There doesn't seem to be any over-arching plot, but each episode presents a short story that is just as spell-binding as the last one. Check it out if you haven't already.