Reiji knows something's up there by just trying to call Nagi. He also did the side stare at Yuri, meaning some serious shit is gonna go down.
Also, spotted Yuri doing something straight from Yuko's manual. Reiji said the reasons why Kazumasa was back and that shit sat like shit on Yuri, didn't take it well at all. That's why she brought the marriage topic out of the blue. She just wants to take Kazumasa out of her way. If it wasn't for Kazu, Reiji would have never come there and find out Nagi was there. Isolate Reiji from his other relationships, just like his mom.
Esemori promised a call with Reiji, but his life is beginning to fade away based on his voice. Gotta guess it's gonna be a symbolic talk in some form of shared abyss dream during the last confrontation with Yuko in those dreams. Because i doubt she'll wake up and rehabilitate. So, that convo has to be on another existential plane.
In the end, the only way to leave the abyss for these 2 fishtanks is by stop giving their backs and face the other, understand and feel the other's pain. That's what Akira and Yuko failed to do, they never came honest with what they actually wanted.