At the age of 16, Shu realised that he had heart failure. Of course, everyone else knew about it. But he still went to school like he was okay. And it looked like he was okay. He was still smiling genuinely. He was cheerful. Despite having heart failure, he is still top of his class and is willing to help anyone with schoolwork.
He is most close with four people. Luca, Ike, Mysta and Vox. They got close during their school years and officially formed a group named "Luxiem" He is closest with Luca.
As time went on, Shu started getting weak. His heart was getting worse, so he is now hospitalised. During Shu's days in the hospital, he's just getting weaker and weaker. Nobody knows how long he has left. Everyone is worried. But the one who worries the most is Luca... Luca doesn't know how long Shu has. But as long as Shu's alive, he'll make his last memories the best and cherish them before saying goodbye...