I think it ends with them living the countryside. For some reason, every person I spoke to there irl always seems to want to go there and escape the city life indefinitely. Gomi's stupid, he thought it himself: he wants to make her his. Yumezora is also stupid, she's at least done this thing this time. Even if she's a serial cheater, they're going to break for the countryside anyway since the husband is going to snap soon and Gomi is basically a saint. The plan would be buy some abandoned property, and stardew valley life.
Also theres no reason to believe the ugly bastard character, him being told off by Gomi was what brought them together in the first place. Ever since then he's been seething with jealousy, so he'd love nothing more than to drag down the whole thing. This story is different from the previous one too, the last story was more like watching someone walk their life off a cliff, with plenty of off ramps they could've simply taken. Contrast to here, where its more akin to a train with several stops along the way.
Anyway the panelling/direction in this chapter is nothing short of delicious. The way Yoshihara looms in the alley like a ghost is intentional, a literal sacrifice made for the behalf of the relationship has come back as a spiteful spirit. Page 13 is particularly interesting, with an incredibly ambiguous but striking shot through an AC unit. Is Yoshihara a sun, beaming forbidden knowledge upon Gomi? Perhaps he was also caught in the spiderweb of Yumezora. Or maybe this is his own spiderweb, having a set a trap to distract Gomi while he's separated completely from Yumezora.