One was without parents and earns for himself, but he has a smile on his face.
And the other has everything but a smile.
One night, they meet each other in a small coffee shop. With hot milk and a warm smile, they do it again and again, night after night.
When they realize it, they've become each other's breath. And it becomes a necessity, like oxygen.
~~ Adapted from the novel Oxygen the Series written by Chesshire and illustrated by Suki