Mushi-shi: The Shadow that Devours the Sun 
 
An anime not for everyone, to say the least, but certainly for anyone who wants to shed light on human mysteries. Ginko as our protagonist, being the most sincere and suave guy you could probably imagine, doesn't miss a chance to research the nature of the mushi. In this special "Hihamukage", he comes into a village which suffers from an unnatural darkness caused by an eternal eclipse. How is this possible and are there any mushi involved in this perilous situation caused by the missing sunlight? Ginko knows that you can't take anything for granted, therefore he has to do two things: convince the people of his earnest actions and restore the state being thought of as granted, where there's enough sunlight for life to flourish. The story is as innovative as it has been the whole series along, and the mystery stays on a level for itself.