Gokujou no Aisare Daigyakuten is a Japanese novel of 113,414 characters, with 6,530 unique words and 1,528 different kanji. Its difficulty rating on Jiten is average, 2.6 out of 5. The full vocabulary list ranks all 6,530 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.