
Main character is 6th grader in elementary school. He comes to Guam island with his twin brothers fleeing from the plague. The uninhabited island gets flooded with time, and there's no other option but to try to flee the island.
Minami no Umi no Odyssey is a Japanese visual novel of 256,696 characters, with 7,632 unique words and 1,409 different kanji. Its difficulty rating on Jiten is average, 2.5 out of 5. The full vocabulary list ranks all 7,632 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.