Investigate the hot chocolate, of course.

But it's maybe not real hot chocolate, given the trouble Shinji's had making edible food be a thing on his own, and either way this bullshit maze business has been entirely too much exercise for him, right now. (He never used to be this weak. But then, he never used to be completely fucked up from taking destructive drugs, either.)

So where he ends up is flopped in the chair, eyes closed, not even trying to keep good posture.