
Will it be his wife in this life, or her sister, whom he swore his love to in a previous life! (Source: Dengeki Bunko, translated)
Unmei no Hito wa, Yome no Imouto Deshita. is a Japanese novel of 224,136 characters, with 10,445 unique words and 1,995 different kanji. Its difficulty rating on Jiten is average, 2.7 out of 5. The full vocabulary list ranks all 10,445 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.