Set during the divine epoch of ancient legends, year 300, Yuuna Yuuki leads a typical life as a second‑year middle‑schooler, yet she also belongs to the "Hero Club," where members confront an enigmatic entity known as "Vertex" in the bustling city of Kyoto, for adventure today. Aired alongside Yuuki Yuuna wa Yuusha de Aru: Washio Sumi no Shō Movie 3 – Yakusoku.
