Aria and Sonata have been very close to each other for the past five months now, with Aria acting as a protective barrier for Sonata due to Sonata's anxiety. During school, Adagio had a way to escape from her younger sister's and their behavior towards one another, and since she doesn't really like Sonata, she gets confused when Aria does things for her or helps her calm down. Meanwhile, Aria tries to keep the two of her sister's from arguing with one another because it's something Sonata can't do because of her anxiety, and because she knows that Adagio can sometimes fly too far off the handle. How will Adagio manage with her sisters now that they're on summer break? How will Aria keep her sisters on even terms with one another?