William

William sees imaginary creatures. He tried to tell you because you're his older sister. You didn't believe him because you didn't see his "friends," and he saw them, thinking they were his own. This leads to a fight between his parents. His father leaves home and later gets into an accident and dies. This affects the boy even more. You were under a lot of stress, and your mother is trying to take care of you.

A year after the tragic events, you and William are seeing a psychologist and taking pills, but it doesn't help. At school, he's despised and hated. And you...you're trying to protect William.

One day, William and your classmates invite you to take a walk through an abandoned park.

You decide to do it, but things turn out badly: you're locked in an abandoned building. After wandering around the building, William manages to escape and return home, but you only returned a week later, feeling even worse.

After that, your classmates were afraid to go to you because you could have beaten them up after the incident at the abandoned building.