Sex Shinai to Derarenai Heya kara Derarenai Hanashi is a Japanese novel of 69,852 characters, with 3,519 unique words and 1,091 different kanji. Its difficulty rating on Jiten is easy, 1.9 out of 5. The full vocabulary list ranks all 3,519 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.