Yuuki Yuuna wa Yuusha de Aru - Visual Fan Book
Source
Yuuki Yuuna Is a Hero
Yuuki Yuuna wa Yuusha de Aru· 結城友奈は勇者である
manga
61
63
76
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: Anime News Network)