
Koi Shita Hito wa, Imouto no Kawari ni Shindekure to Itta.: Imouto to Kekkon Shita Kataomoi Aite ga Naze Imasara Watakushi no Moto ni? to Omottara is a Japanese novel of 593,153 characters, with 13,312 unique words and 2,247 different kanji. Its difficulty rating on Jiten is hard, 3.7 out of 5. The full vocabulary list ranks all 13,312 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.