Gekkou Kamen: Yuureitou no Gyakushuu is a Japanese movie of 8,553 characters, with 989 unique words and 488 different kanji. Its difficulty rating on Jiten is hard, 3.5 out of 5. The full vocabulary list ranks all 989 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.