Following requests from some of the students, Mari agrees to hold a "school closing festival" for Uranohoshi. However, preparations are set back after Shiitake sneaks into the school and causes damage, so everyone stays up late to get things ready for the next day. As the festival gets underway, Chika checks out the various attractions, which includes her classmates arranging a balloon display for everyone. At the end of the festival, Mari almosts breaks down in tears of regret, but is cheered up by cheers of support for Aquors. (thetvdb.com)