I checked out Ep1 & Ep3 to watch Morita, I thought her acting was superb, but she does look chubby. The way the story went seems like she may get more screen time but I'm not sure if her character would be even matter towards the end, so that's sad.
The drama itself I felt was rather superficial, they try to make it very suspenseful but doesn't quite have enough realism, I find it rather boring.