Yuuki Yuuna is a Hero: Washio Sumi's Chapter 2 - Spirit

In the year 298 of the Divine Era, elementary school girls Washio Sumi, Nogi Sonoko, and Minowa Gin are entrusted with a pivotal mission: to become heroines and take on Vertex, a mysterious foe assailing Shinju-sama, the god tree that protects Shikoku, the last habitable enclave on Earth. What they don't know is that this battle will exact a price far beyond anything they could have imagined.