Other ideas

The normal life of a teenage boy changes in an instant as a lost friend enters his life.

'''The lost friend claims the teenage boy is part of a fake life, one created and directed by people with a god complex. There's no time to explain everything here, they might be watching. Believing both the situation and this lost friend, the teenage boy oddly willingly agrees to the proposal, it might be a mistake, but both options could've been the mistake, one had to be chosen.'''

The relaxed life of a young guy take a sharp turn as a childhood friend enters his life.

The childhood friend claims the young guy is one of the rare few people in possession of a guardian animal spirit. It's widely known these exist and rituals are held on a near weekly basis to connect with these guardian spirits, now its time to be the center of that ritual. Suspicious of this situation, but somewhat trusting of this childhood friend, the young guy cautiously agrees to the proposal, surely this was the right choice to make, all of this has to have some truth to it.

But what if this childhood friend cannot be relied upon. Or what if this proposal is wrong or missing important details. How could an ordinary young guy be this important to the situation. No turning back now though.