you have to continously choose to dismiss Ren during your first meeting in the library. Everytime the game restarts after you choose to block his number, you have to replay again and again until it takes you to a dark and dismantled version of the main screen! I hope that helps!
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Unfortunately that has me still a bit lost since I got that main screen but they were still just "???" though I may have done it wrong when that happened since I think that might've been when they changed from "LOCKED" (not too confident about when they changed so that last bit is a guess lol). I wouldn't be against hearing spoilers if it'd mean you'd be able to explain a bit more though, I had to look some up to get the "decay" route anyways. Oh, and thank you!