Having finally finished my slow burn of this series all I can do is agree with other comments here. This series offers a sense of tranquillity when watching that I have rarely seen anywhere else. You just get absorbed into sometimes dreamlike atmosphere of it all. Each episode is somewhat self-contained and you really never know how it will end. Some end on a happy note, some on a sorrowful one, some are more ambiguous or bitersweet.

The message throughout is very much that Mushi are not malevolent or evil, they are just like forces of nature, and can be harmful or helpful to humans. Each story is more about how people deal with these things, with Ginko travelling around and helping where he can.

With a second season just around the corner all I can really do is repeat other people's recommendations - if you haven't already, watch this series.