Honto Ni Atta Kowai Hanashi: Natsu no Tokubetsu-hen 2018 is a Japanese movie of 11,510 characters, with 1,233 unique words and 588 different kanji. Its difficulty rating on Jiten is average, 2.8 out of 5. The full vocabulary list ranks all 1,233 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.