It's either Mayuko realising "Ayahiko" is Makoto there for a second or still stuck in the division, because she was trying to strangle him there...
The souvenir Mayuko received from Makoto, claiming it's from Ayahiko who's deceased... yeah they're quite convinced she's delusional, yet scoffed it off... They're the absolutely worst coworkers...
Mayuko describing Ayahiko in work, like that manga Makoto gave her while she was in highschool, maybe that's when she made up her delusional world to cope after her rape? Hmm...
Another person is referring to Mayuko in university she was "fake" and "stalker", was that before rape or after I wonder...
Thanks for scanlation!