As the summer holidays are almost over, all the students are slowly arriving back at the IS Academy. Charlotte and her new friend Laura are out shopping together in the city. Cecilla is also back from England, while Houki and Fan have passed the time by training and lazing around. But before the new school year starts, Ichika wants to go to the water park and the summer party with the other pilots. Naturally, they all get it wrong again and think it's a date. Yet, as our six friends are enjoying themselves in the swimming pool, a lone assailant enters the school's underground catacombs in order to steal a sealed IS. And even the intentions of student council president Tatenashi Sarashiki are not yet apparent.