Story about an unknown man...
Just to explain the build up.
The uneven chapters are as in the present. (but told in past tense)
The even chapters are about the past. (explaining things that happened 10 years before the present)
His best friend gone, and no one seems to understand what he is going through. His life has been turned upside down but suddenly, a mysterious girl has appeared to help him cope with what he is going through. By talking about his memories, saying them out loud, he is learning just how to come to terms with what he has been burying deep within him all this time.