I feel there was way too much psychological build up for it to be resolved this way. Sometimes you gotta tone down your story or else it'll feel disconnected from its end. Like, even if they did extras or another volume the last chapter already changed all the dynamics that needed development. It's such a shame, such a good set up.
It startes out horribly and each new character just mates it worse. They should ve divorced when the pervert assaulted her in the fucking day of the wedding fuck them all manipulative af.