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.

After managing to recruit both Ann and Mikan to join the project, Misaki, who is working to erase Hinano's debt within six months, puts up a poster for more applicants, attracting costume designer Mana Midorikawa and technician Genki Aoyama.

As the girls find themselves needing a new place to practise, they are approached by a rhythmic gymnast from another school named Kanon Shimura, who is baffled to find Ann had quit rhythmic gymnastics to watch tokusatsu shows.

Struggling to write her next script while also wondering if she still has a place in Hina-Nectar, Mikan proposes a trip to the beach for a change of pace.

Watching the show online, Misaki is surprised to see the girls sticking to the script that included her role. Just then, Mikan begins adlibbing, throwing in a plot element that reflects the turmoil Misaki is going through and their desire to support her.