I became aware of the atmosphere.

Hello, my name is Sora (Sky). Until that hot and short summer ten years ago... Ten years ago, at seventeen, I became air. Air has no elemental symbol, no color, no taste—nothing. It is "nothingness." Swayed by the wind, it drifts gently, wandering to people and animals who need it. It exists everywhere yet no one notices it. It is a commonplace existence, never appreciated or thanked. But you see, air transforms into various things and races through bodies, playing tricks along the way. The "ki" (spirit/mood) in air—killing intent, gloominess, cheerfulness and so on—is invisible to the eye. It is the easiest way to control human emotions.