
High school student, Takeru Kisaragi who had gained special physical abilities from the accident of his past, lives in a modern society without changing much though uncomfortable. However one day, a mysterious light engulfed the warehouse in his house, and the next thing he knew, he's in a world where "swords" which is used to amplify magic ruled the world. And a beautiful girl with a black hair and black eyes named herself as Sakuya. "Floating on the altitude above 15,000 meters, the world's only floating city―Ether Float." Elites from different nations gathered in one school, the Sealed Sword Academy, where the stage for peerless fantasy battles are unfold! Initiate! (Source: Sauri's TL Blog)
Soshite Fumetsu no Regnare is a Japanese novel of 418,502 characters, with 12,684 unique words and 2,000 different kanji. Its difficulty rating on Jiten is hard, 3.4 out of 5. The full vocabulary list ranks all 12,684 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.