Even during summer break, the Amusement Club lives up to its name! When Akari Akaza, Kyouko Toshinou, Chinatsu Yoshikawa, and Yui Funami find a camping tent, they decide to put it to good use by spending the weekend outside in the mountains. When some student council members catch wind of this, they are invited to come along as well. After a very long journey, the group arrives at their destination and is ready to make the most of their trip. They engage in classic camping activities, such as outdoor cooking and tests of courage, and finish it all off with a visit to the hot springs. An extravagant trip like this doesn't happen every day, but the Amusement Club is sure to savor each moment.

The members of the Amusement Club are back with more of Kyouko Toshinou's antics, Chinatsu Yoshikawa's schemes, Yui Funami's retorts, and Akari Akaza's small social presence as they strive to make each day as fun as the last! Whether the activity is an arm wrestling contest or making pancakes together, the group of entertainment-seekers are sure to give it their all. The club members are often joined by their friends in the Student Council, who know how to have a good time as well. While it can get a little chaotic when all eight girls get together, it sure doesn't stop them from meeting up and having fun!

The second movie in the Washio Sumi no Shou trilogy.

Having fulfilled their destiny during the events of Yuuki Yuuna wa Yuusha de Aru, Sanshu Middle School's Hero Club—consisting of Yuuna Yuuki, Karin Miyoshi, and siblings Fuu and Itsuki Inubouzaki—is back in full swing, helping out those in need wherever they can. They have also gained a new member, a hero from the past named Sonoko Nogi. But eventually they notice that someone who should be among them, Mimori Tougou, is missing; any trace of her existence is completely gone, save for the girls' memories. With no leads on Tougou's whereabouts, the girls regain the ability to transform and begin the desperate search for their lost friend. But what they find is more shocking than any of them could ever have imagined, and the consequences of their actions begin to change life as they know it.