Yuuki Yuuna wa Yuushabu Shozoku 3
Japanese title: 結城友奈は勇者部所属
Type: Movie
Episodes: 1
Source: 4-koma manga
Genres: Comedy
Studios: W-Toon Studio
Duration: 8 min
Rating: PG-13 - Teens 13 or older

The story takes place in the era of the gods, year 300. Yuuna Yuuki lives an ordinary life as a second year middle school student, but she's also a member of the "Hero Club," where club activities involve dealing with a mysterious being called "Vertex."

(Source: ANN)

Aired along side Yuuki Yuuna wa Yuusha de Aru: Washio Sumi no Shou Movie 3 - Yakusoku.