Takeru's worst nightmare:
Takeru was, put simply, trapped.
Cursed to remain forever 13 seconds out of sync with the rest of the world, and unable to kill himself, he will be forever alone. And worse, he will never, ever, be rescued.
Because everybody that ever knew him...
Has forgotten him. Forever.
And he will be forced to watch the burn. His friends and family will die in front of him, and he will be unable to avert his eyes, and their fates to die in some horrible manner. Over and over again.
And he will never be able to tolerate it.
Because he will care too much.
And he will try. Oh he will try.
And fall into the blackest despair when he finally realizes he can't change it.
Thank god this is only a nightmare, a dream, eh?
... unless of course, it isn't.
But it's not possible, so don't worry about it.