I actually got the same problem on my pc, granted its a very old model I thought it was just a problem with me but maybe it's just a bug. I also looked up the system requirements and my OS can barely run this VN soooo.... maybe it's your RAM or the graphics maybe?
I would think that but i opened today OurLifeNF-1.1.0-pc and it works without that problem and my pc not very old, runs Our life 1 normally. So i have trouble only with newer version.