A festival celebrating the World Tree is taking place and Astarotte's friends help her prepare for a singing performance. After some training and a bath, the girls, along with Naoya, head to the festival, where they have a brief run in with Sigurð. With Astarotte still nervous when it's time for her performance, Asuha helps her out by joining in the singing. After the festival, Asuha brings up the question of what Naoya intends to do after summer vacation ends.