The anime's story is set in the era of the gods, year 300. During the Shinju crisis, heroes and shrine maidens from every era are summoned to the world inside the divine tree. The girls in Sanshuu Junior High School's Hero Club transform as part of a huge 27-member family. Fuu Inubouzaki, the club president who gathered these powerful friends together, announces the development of the long-awaited Hero Club Udon.

[Source: Anime News Network]