
14-year-old Sunaoko travels from Tokyo to Naha, Okinawa, with her father’s young fiancée Momoko in search of her half-brother whom she has never met. Their guide, a beer-guzzling ex-soldier, takes them to the locale’s tourist attractions, quickly delving into the underlying scars of the island’s wartime history.
Natsu no Imouto is a Japanese movie of 16,244 characters, with 1,709 unique words and 729 different kanji. Its difficulty rating on Jiten is hard, 3.1 out of 5. The full vocabulary list ranks all 1,709 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.