Mami goes back on her offer to take Kazuya to her place, as she claims her brother is home (her text relays no such thing), but that offer leads Kazuya to ask if she wants to go to his place instead. Mami blames that offer on the alcohol, then continues to rag on Mizuhara as someone prone to flying off the handle.
Despite his intense desire for Mami’s continued approval, Kazuya finally challenges Mami’s barbs and defends Chizuru, throwing her off balance, then runs off. He eventually encounters Chizuru on the balcony, and the two mostly make up, but a blubbering Kazuya once again blows past the client-rental girlfriend boundaries.
Kazuya ends up going on a beach trip to Shimoda, Izu with his friends, including Mami, who said it was okay for Kazuya to come with his girlfriend. Of course, it’s not okay at all, but since as far as she knows they’re a legit couple, Mami has made it her mission to break the two up.
Judging from what we’ve seen of her and her “dark side” when she pounds toxic vitriol into her private Twitter identity “Numa”, Mami is only still interested in Kazuya because he’s acquired a hot girlfriend. If he were still single, she probably wouldn’t acknowledge his existence. It’s not about her getting him back, it’s about taking him from an opponent.
And darn it all if Mami is not an absolute master at using the tools at her disposal, what she knows of Kazuya, and how she knows he felt about her to keep him in a constant state of imbalance. He can’t take his eyes of her adorable stars-and-stripes bikini, and she even brings up the good times they had together, going so far as to lament the unborn “Maya”, the name they said they’d give their firstborn child.
Just then, Mizuhara appears in the form of the braided, glasses-wearing Ichinose, and since this is that kind of show it seems even Mami knows she and Mizuhara are one and the same. Still, the fact one of their friends knows one of her friends makes the rental girlfriend and college classmate identities way too close for comfort.
The universe would seem to be having fun continually bringing Kazuya and Chizuru together, because they not only end up in the same supermarket, but the same bathroom within that supermarket. Kazuya informs her he and Mami are getting along, but tells her he feels bad even though she’s not his real girlfriend; after all, there were moments when Chizuru has stuck her neck out not out of her professional obligation, but because she’s a good person.
Of course, there’s nothing more humiliating or cringe-inducing to Chizuru than hearing Kazuya doing something resembling having pity on her for pursuing his ex, so they end up in a shouting match…which gains the unwanted attention of Mami, who came to help Kazuya with shopping.
When Chizuru is trapped and Mami isn’t buying Kazuya’s half-baked lies, Chizuru comes out in her bikini so as to at least take Ichinose off the board. Of course, the result of this surprises everyone, as they thought she couldn’t make it to the trip with Kazuya.
After “stealthily” zipping up her jacket after catching a sight of Chizuru’s swimsuit, Mami switches to conciliatory mode, apologizing for her words the other day. But then she’s off alone by herself, unleashing another twitter-storm of pure disgust, and the expression on her face scares away a random guy who tries to hit on her. It seems the account is a release valve for her true emotions, so Kazuya isn’t the only one hiding things.
Chizuru tells Kazuya she’s leaving and tells him to make an excuse for her, and they bring up the fact that this could all have been avoided if Kazuya told everyone they broke up. Of course, it’s too late for that. Mami is close by, but seemingly doesn’t hear the specifics of their chat.
After some awkward conversation on the beach, Kazuya goes off on his own, leaving Chizuru with his friends, but Mami lures him to a rock outcropping where she apparently lost her expensive bracelet. While he looks with her, she slips on a stone, falls into his arms, and Mami makes her move, pulling close and kissing him. He doesn’t recoil. This, just as Chizuru is being asked how she can let her boyfriend go on a trip with other girls, and her responding that she “trusts” Kazuya.
Of course the only thing he can be trusted to do is maintain this increasingly complicated, ultimately untenable limbo! He knows Mami would laugh him into the stone age if she learned Chizuru was a rental girlfriend. And yet, he just can’t resist Mami’s flirting and advances, despite her thinking Chizuru is his legit GF, thus making anything he does with Mami cheating.
It remains to be seen if Chizuru simply doesn’t want to hurt Kazuya’s gran, or if she actually developing feelings for the guy. I’m pretty confident that if Kazuya “dumps” Chizuru for Mami one afternoon, Mami will dump him later that evening, her objective achieved. Then again, I’m starting to think Kazuya and Mami deserve each other. It’s all kinds of wonderfully, horribly messy, and I am freaking here for it.