
You and other people are part of some study, and you all have to live in a dark two-story mansion with all the windows shut closed with wooden planks.
Juujigen Rippoutai Cipher ~Aoki Tsuki no Suitei~ is a Japanese visual novel of 495,910 characters, with 13,728 unique words and 1,908 different kanji. Its difficulty rating on Jiten is average, 2.3 out of 5. The full vocabulary list ranks all 13,728 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.