I can't help but re-play the 4th day out of pure boredom (And my outstanding love for Ren my wonderful bbg) I honestly cant help but think (Small spoilers ahead?!) about the threats we get sent. Basically, after we return to Ren's place and choose the option to snoop around his desk, in the dm's we see there's that person, who i'm guessing is Ren's friend to whom he lended the car to cause of some of the messages, I have a small gnawing feeling that it may be the person that's sending threats to the mc? Like basically, to "scare" them into runnin to Ren for comfort/avoiding to go back to their own appartment and instead stay with Ren at any possible time, which could be possibly by Ren's request aswell?
And the fact that the friend talks about someone called '"O" (if I remember corectly) could they also be obsessing over someone else, like Ren is over mc?
Honestly, no idea i'm just yapping, but this is some tea for thought either way>:}