Saving The World Isn't Easy

With the Sugula defeated, the world has regained its future and blue sky. However, that's not to say all the world's problems are solved. I'm now seventeen years old and the power of Stella, which my body has grown used to over the years, is starting to have a negative effect on those around me. But just as I'm stumped by this predicament, someone appears before me... And it's none other than Air himself?! Now I'm going to train under Air to learn how to control the Stella's power!