結城友奈は勇者である -鷲尾須美の章- 第３章「やくそく」

By the final film Sumi Washio, Sonoko Nogi and Gin Minowa have been Heroes long enough to know exactly what the Taisha will ask the next time the Vertex climb toward the Shinju. Shikoku is the last habitable ground, the tree's barrier is what holds it, and the same three girls keep being sent out. Closing the Washio Sumi Chapter trilogy, it ends the light novel prequel two years before Yuna Yuki's Hero Club takes up the same fight.