Ikenie no Kunshuron is a Japanese novel of 156,323 characters, with 9,541 unique words and 2,078 different kanji. Its difficulty rating on Jiten is hard, 3.5 out of 5. The full vocabulary list ranks all 9,541 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.