Anime 24701 Mushishi Zoku Shou 2nd Season Episode 2

Synopsis

A man feels something vaguely familiar, yet terrifying, as he smells the scent of flowers at night. As an old man, walking through the woods, he finds a tunnel, and is compelled to enter it. While going through it, he reminisces about important events in his life up to that point, but it seems there is something he can't quite recall. Perhaps long ago, the visit of a traveler looking for shelter on a rainy day, might help shed light on the unsettledness he feels.

(Source: Wikipedia)