Ep. 1: Sumi Washio leads classmates Sonoko and Gin as heroes in year 298.

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Set in the Era of the Gods, year 298, two years before "Yuki Yuna is a Hero," Sumi Washio is a sixth-grade hero chosen by the Shinjyu. She protects the world alongside her classmates, Sonoko Nogi and Gin Minowa. Although Sonoko and Gin appear to be trouble-makers due to their idiocy or excessive energy, Sumi feels excited about her role in leading the group. The narrative highlights the dynamic between the determined leader and her chaotic peers as they face their duties. This summary reflects the premise provided in the source material without adding external plot details or marketing language.