Suddenly, the Heavenly Realm!"

With the popularity of "action heroines", many districts have had local heroines of their own, complete with live action hero shows. In Hinano City, Mikan Kise takes her younger sister Yuzuka to a hero show of the most popular local heroine, Kamidaio, only to discover the show had been cancelled at the last minute. Not wanting to disappoint Yuzuka, Mikan asks Kamidaio fanatic Ann Akagi to help put on a Kamidaio show for her the next week. Thanks to their practise and choreography, the girls manage to make the show a hit with Yuutsu and her friends, but inadvertently knock over a tower in the process. The next day, after discovering their show had been uploaded online, the girls are summoned by student council president Misaki Shirogane, who asks them to become Hinano City's new action heroines.