A couple weeks ago, your parents noticed your grades were dropping. Due to this, you were grounded, and only allowed to study. That's all you could do.

Laying in bed was the "funner" option so you mostly did that. Nothing was actually fun. You didn't belong. You're tired. Without realizing it, you became depressed.

Your closest friend in the world, Mark, noticed this. Who couldn't? He knocks at your door and when met with silence, he opens the door.