Hagane Orchestra is a tV short anime that premiered in fall 2016, produced by Fanworks.

About the production: the story comes from a video game, there are 12 episodes of about 5 minutes and its current status is "finished".

Its main genres are adventure and comedy, with themes such as Parody, Vocal Synth, Meta and War.

On AniList, Hagane Orchestra has an average score of 52%, an average score, and appears on 1,831 users' lists.

The people of this world live happily, despite its inhospitable landscapes. Kureha and the other members of the Defense Squad living in the Irodori Settlement spend their days here in meetings to figure out how to get more people to play "Hagane Orchestra," the smartphone game they appear in. They'll do anything to promote their game! The inside story about the game? Its inner workings? Anything goes... be it friendship, determination, betrayal, or despair. A young man tells his story, along with the girls, his friends, and the Haganes. All work together as one, just like an orchestra... (Source: Crunchyroll)

Official synopsis from AniList.