Blue Monday Specter

Luka is bullied at school because of his background. The only friend he has is Ian, his dorm roommate. Each time Ian steps in to help, Luka can’t help feeling helpless. One Monday, he skips class and sneaks into an abandoned library, only to find someone already there. The boy introduces himself as Oliver and soon becomes someone who truly understands him. But there's one problem, Luka is the only one who can see him...

(Source: LEED Publishing, translated)

Note: Includes one extra chapter.