How can we be like others?

A boy named Acacius, 19, as he grow older he had a fun and exciting life, always dreaming to be the best artist in the whole wide word, but one unusual day everything turns to be weird. He sees, encounter, hears, smells and touches things that other people don't sees, encounter, hears, smells and touches. He had a unknown disease in his head that makes him feel paranoid and unsure of the things around him.

And then he meet Nebula, a girl who doesn't like people and always stay at the side of the library, day dreaming about things.

Everything is unsure for him until he met her.

But what if she isn't real, what if she is just an illusion. And the question that always present to him is, how can we be like others?