Yuuki Yuuna wa Yuusha de Aru: Washio Sumi no Shou

Sumi Washio, Sonoko Nogi, and Gin Minowa are ordinary schoolgirls chosen by the great Shinju to become heroes against the Vertex, mysterious enemies that threaten the world protected by their gods. Their first battle quickly exposes how little experience they have, and surviving it teaches them that friendship alone will not make them an effective team.

The three train, learn each other's strengths, and grow closer as new Vertex attacks arrive. Yet the power granted to heroes carries consequences they do not fully understand, and each victory draws the girls deeper into a system that demands far more from them than they were ever told.