Sharakuna: Kaiki Shinrei Kenbunroku

A young editor, who faints with anything scary, ends up being in charge of the mysterious novelist Sharakuna! The elusive author claims he is in a slump and needs an actual "horror experience" to finish his manuscript. He convinces the editor to join him in visiting many haunted hotspots.

(Source: Natalie.mu, translated)

Note: The chapter count includes two extras.