
"Why does no one remembers the true world...!" The era when the great race of the five tribes competing for hegemony on the ground ended with the victory of mankind led by hero Sid. However, that world was suddenly "overwritten" in front of a boy Kai. In the rewritten world, Kai saw the scene where humans lost to the five tribal wars because of the absence of hero Sid—here dragons and demons dominate the ground, and Kai is a forgotten existence from all human beings. However, after encountering the mysterious girl Rinne, Kai decides to break this rewritten destiny. In a world without heroes, he inherits the hero's sword and martial art and challenges the mighty enemy races who reign.
Naze Boku no Sekai wo Daremo Oboeteinai no ka? is a Japanese novel of 724,640 characters, with 16,432 unique words and 2,330 different kanji. Its difficulty rating on Jiten is hard, 3.6 out of 5. The full vocabulary list ranks all 16,432 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.