What Cursed said :)
No spoilers, but the kids are going to be safe, yes. The prospect of seriously hurting or killing children - even in fiction - just to spark an emotional reaction from players makes me feel icky. I'd only do it if it was very important to the story, but this isn't that kind of story. So they're safe.
And Gwen isn't going to maim or murder any of the main or side girls. MC wouldn't like that, and even in her full-blown Yandere state she's still obsessed with only doing what pleases him :)