To find the warmth once more(COVER IS NOT MINE)

Death was cold, Yuma found out. You can't really feel what it is that killed you, just the freezing realization that you won't make it.
Most importantly, death was lonely. When you're dying your brain shuts down before your body will. Even if you are surrounded by thousands of people, you would be able to tell.
That's what Yuma found out. He also found out that once you start that path of being alone, it won't stop.
OR
Afto interferes with Yuma's life, and things go different.