Three girls are supposed to save Earth from asteroids. Instead they're stuck in an arcade playing crane games. The show commits completely to this bit, never once breaking character to explain why any of this is happening, and that anarchic refusal to make sense is where the actual comedy lives.

A swarm of asteroids is headed for Earth, and only three high school girls, Mirai, Ayaka, and Kyouko, have the potential to stop it. Sayo, an agent of a secretive organization, recruits them but keeps the real stakes hidden, telling them instead that they have been scouted as idols. The girls are eager for stardom, yet they end up working at an arcade, where Sayo insists that mastering crane games is the first step of idol training. Unknown to them, a new crane game skill from the three of them can create an energy beam able to push the asteroids off course. As their technique improves, they begin to wonder what Sayo is really after. The result is a short-format comedy built on the gap between a planet-saving mission and a day job at the claw machine.