This looks to be laying the groundwork to make Shouko possibly become the linchpin for whether the ending is a happy one or not. Sato is unlikely to harm or even threaten Shouko. As far as people who aren't Shio go it seems like Shouko would rank basically the highest on Sato's scale of personal value. I think the most likely outcome is Shouko not going to the police or anything but becoming worried about Sato and her actions and inadvertently causing drama when she ends up leading Asahi to Sato and Shio.
Edit: Actually Shio's attitude towards Sato is probably going to be enough to make Shouko worry less, at least about Sato doing anything wrong. She'll probably still worry about Sato technically doing something illegal (kidnapping) as well as wanting to get the full story behind what's going on.
last edited at Jan 29, 2017 7:03AM