Kousuke is shown at work. He is ostracized. The opening has him out very literally out alone in the cold. He's apart from the other smokers, and on his way back in the ladies in the elevator very literally talk about him behind his back. His coworker who who had a crush on him is completely ignoring him (and while discussing the inn project they'd worked on together), when he wants to go out after work his friends are doing that 'ha ha ...well, maybe some other time' way of saying 'yeah....um, no, never'.
His company hasn't (and won't) fire him, but they aren't sending him work. He is the only one at the section without anything on his desk. This is management telling you that you aren't worth firing, and they are relying on your peers socially pressuring you into leaving, and their last memories will be not of your hard work but of you being a deadweight freeloader. He's also shown before having been promoted to section chief, but someone else is talking directly to his supposed subordinate with him right there. Basically he is a complete pariah at his job.
But we're told by his monologue that he's still planning on a future with Koto, and just dealing with it. He's staying the course despite the what his job (i.e. society) is doing to him. But as the Club Girls tell us, his eyes are dead. Its getting to him, he's being worn down.
Miya is shown still hanging out with her boy, and boy is telling her to stop obsessing over what her father is doing and "eat her fries" - who cares what your dad is doing, focus on enjoying your own life.
In the final chapter, Kousuke goes to the cafe he met Koto in. He says seeing Koto is against the rules without contacting "her" first; maybe the original japanese is more clear, but I'd guess is 'her' refers to Koto's mother. Which I take to means implies that Koto's mother has accepted their relationship to some degree, and presumably meaning that Kousuke isn't allowed to see Koto without her mother chaperoning. (Based on comments/dialogue in the other chapters about it having been a few months since they last saw each other, I'm presuming that means they've been in contact since the events of chapter 58)
Koto is working at the cafe again, showing us things are going better with her mother (something Koto explicitly confirms a few pages further). Kousuke is having a hard time, and starts to show his doubts. Maybe someone had a better description/context but in response, Koto tells him a story, that she recants as just a lie to distract him (and the reader) - at at the end of it, Koto has grabbed his hand when they were simply walking side by side before.
After this, we see them see another permutation of the "Moon" allegory that we've seen several times before. This time, instead of simply leaving the moon hanging there, it is 'stolen' and kept between them. Kousuke can know that Koto loves him and her feelings will with be with him, even if they can't be with each other physically currently.
The final panel is Kousuke announcing he is home. Which I believe means he and Miya are patching up their relationship - he would need someone in the apartment to announce his arrival to. Especially with the diner scene with Miya, I'm taking that to mean she's dealing with what's going on.
so tl;dr is that Kousuke and Koto are in it for the long haul and planning to continue their relationship once Koto is legally an adult. Koto and her Mother are detoxifying their relationship. Kousuke and his daughter are working on patching things up. The present is rough, but the future is hopeful.