The Side Character's Main Story

We all know that a side character is just a supporting character to the lead of the story.
Best Friend, Friend, and any other role or status.

We're all main characters of our own story, right? So why did I even entitled this story as "The Side Character's Main Story." Well, that's because he is a side character of his own story, but not a literal side character. A main character who looks like a side character because of the things that he is doing.

The first day of class, a teacher asked her students to pass a story, "their story". For a year, they must create memories, happenings, and such events that could create a wonderful experience for their life. However, there is one guy named Sky, who is not capable of doing this, he's cold, anti-social, and he's entitled as the "Lone wolf" for always being alone, but why is he like that? A girl named Jenny who is the complete opposite of Sky, will enter his cold and dark world to find out why, and as soon as she gets deeper in the abyss, she finds a very surprising thing.

So with this kind of Blurb, how do you think it will go? How will Sky create his story? And what will happen to Sky's life with Jenny? But most importantly, How is this story connected with the title?