Title: Washio Sumi wa Yuusha de Aru / Washio Sumi is a Hero

Author: Takahiro

Illustrator: BunBun

Genres: Fantasy, Magical Girls, Drama, Action

Translation: Baka-Tsuki

In the year 298 from the era of the gods, elementary school girls Sumi Washio, Sonoko Nogi, and Gin Minowa are tasked with an important mission. They are to become heroes and fight Vertex, a mysterious enemy that is attacking Shinju-sama, the god tree that protects Shikoku, the only area in the world that is still habitable. What they don’t know, is that this fight will cost them more than they could have ever imagined.

This is the Light Novel the anime Yuuki Yuuna wa Yuusha de Aru: Washio Sumi no Shou is based on.
Watching the original Yuuki Yuuna wa Yuusha de Aru anime beforehand is very suggested.
This novel also contains the two short stories “Sonoko After” and “Second Volume Hero’s Memoir”.
Epub from JLN with a bunch of fixes.