The single-cour series has been added in full in its original Japanese language with English subtitles here for viewing.
The Yamibou: Darkness, the Hat, and the Travelers of the Books series has now found its way to some new streaming as the folks at Pluto TV have added it to their service.
Hatsumi wasn’t there, though, so the search for Hatsuki’s great love begins and involves traveling from book to book.