Some minor points to address here:
- Akiba is, unceremoniously, calling Sousuke by his first name now, no matter the situation. For him, as much as he tries, when push came to shove, he called her Megumi-san;
- Akiba is jealous of Sousuke, and she doesn't even hide it anymore;
- The biggest problem, at least for now is: Kanebayashi.
If she knew Sousuke would become an enemy, and kept an eye on him, to the point of tracking his moves, then she knowing he went after Akito and that Shuri/Miyabi was his target in the party, is understandable.
But at the same time, today she says that Sousuke is into NTR, but last time it didn't work, so Iwabuchi and his staff switched from Misato to Akiba.
OK and all, but...didn't we see, from the last 2 chapters, that Rika
KNEW, from the start, that Sousuke would break Akiba into the situation? And that Akiba was the target all along, not Misato? So why doesn't it seem like Maruppi/Kanebayashi knew about this?
If Iwabuchi knew and didn't tell her, her entire teasing of Sousuke in chapter 83 and 84 would amount to nothing, and she played the fool without knowing.
It could be Iwabuchi didn't tell her about this...or even, but just maybe...that Iwabuchi himself didn't know about Akiba, and Rika played with him and Maruppi just to get Akiba herself, in her own way, and prepared to switch targets on the spot.
I don't know, it seems rushed at any one point...