
There is a small independent country " Seikoku" located in remote mountains. Main character gets attacked by a zombie one night. Then a large army of the dead comes under the walls. Among protagonist's troops one girl is found out to manipulate zombies. A way to oppose this huge undead threat must be found with any means possible.
Gekka no Kirameki is a Japanese visual novel of 612,717 characters, with 15,086 unique words and 2,225 different kanji. Its difficulty rating on Jiten is hard, 3.3 out of 5. The full vocabulary list ranks all 15,086 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.