
Hiyori, who has moved into her great-aunt's house for some reason, one day finds a Shikigami named Seiji in the bamboo grove around the house. Hiyori ends up helping out her great-aunt, who runs a divorce agency, but this leads to a connection with her late great-grandfather...!? (Source: KADOKAWA, translated)
Ayakashi Senmon Enkiriya Kagami no Mamorite to Suzume no Shikigami is a Japanese novel of 105,870 characters, with 6,526 unique words and 1,656 different kanji. Its difficulty rating on Jiten is hard, 3.4 out of 5. The full vocabulary list ranks all 6,526 words by how often they appear, and you can study them on Jiten or download them as an Anki deck.
Here are some of the words that appear most often in this media, as well as a sample of its rarer vocabulary.