All the theories you guys shared are incredibly fascinating and mindblown. It make me with almost no room to question.
Taking all this in, it makes me wonder again, why does Sousuke seem so valuable to Rika and Iwabuchi, to the point where they are so desperate to see him suffer or down ? For Iwabuchi, there might be a logical reason wanting to ruin Sousuke because, in his eyes, Sousuke stole Rika from him. But what about Rika?? The only thing that comes to my mind is that Sousuke is valuable because Rika sees him as someone truly special to her, in other words, Rika is actually in love with Sousuke.
Think again about it, if Rika's goal from the start was just a business, she could have easily chosen a much more influential husband. Someone like a politician, or if she was truly addicted in social media, it would make far more sense for her to marry a man with heavy influence in the media industry. I'm sure it wouldn't bedifficult for Rika to seduce and control men like that, especially after we've seeing how she manipulates and controll the people in the PTA. Yet, instead, she married Sousuke a man who is in my opinion, brings no value other than the simple fact that he is deeply in love with her.
And that brings us back again to the contradiction. If Rika does love Sousuke, it bring back the to the question exactly like what Sousuke said "she wants to experience an greater/ultimate love, but why does she acts just making people hate her instead?" So, I feel like the "missing piece" is going to be the absolute turning point for how Rika and Sousuke's relationship resolves. But, I still put my faith in MITA. if Rika is truly doing all these awful things, she will definitely get her karma in the end