Kazuya dives in and rescues Chizuru from drowning, which is a big deal, even if the two weren’t in a complicated relationship that has long since blown past professional detachment. They wash up on an islet, and Chizuru wakes up first and realizes what Kazuya did for her…then notices Kazuya isn’t breathing.
Chizuru administers CPR—and mouth-to-mouth—and Kazuya comes to, none the worse for wear. Both Chizuru and Kazuya appear to have difficulty separating the romantic from the practical (in the case, from a kiss of life). On the way to hospital Chizuru later recalls Kazuya’s heroism and can’t help but turn beet red.
Things are relatively simple on at least one front: Mami’s. She doesn’t take kindly to being stood up (especially after hearing how Kazuya was indisposed) and rolls up her window without speaking to him. That’s probably not all, but it suffices for now.
In a masturbation scene that goes on way too long, raunchy images of him with Mami are gradually replaced in his head by much purer images of Chizuru. He concludes that he’s fallen for her beyond the point of no return, which means their imminent “breakup” will hurt him more than he’d hoped.
Leave it to Kazuya and Chizuru’s grandmas to make sure things don’t get any easier for the kids. Kazuya joins his gran at a hot springs hotel in Gunma to celebrate her discharge from the hospital, and the moment Chizuru’s grandmother appears, it’s clear the two set things up so their grandkids would have a room all to themselves, to enjoy their youth and have sex—both old ladies lament how reserved the kids are.
After simmering in anger and frustration, Chizuru decides to let go, at least for the duration of the trip, and enjoy herself to the fullest. That means availing herself of the baths (where she and Kazuya’s gran have a nice heart-to-heart), and lowering her guard so she and Kazuya can have a pleasant meal together.
This is a new Chizuru who is neither pretending to act like his girlfriend nor the “off-duty” version of herself who openly loathes him. As a result, Kazuya gets to see and hear a genuine laugh from Chizuru. When bedtime arrives, Kazuya proactively starts to make himself scares before she asks him “what the big deal” would be if they slept in the same room.
This episode much clinches it, if it wasn’t already pretty obvious: Chizuru doesn’t dislike Kazuya, nor is she indifferent towards him. I’d go so far as to say she likes the guy, and realizes that Kibe is right that he’s not a bad guy. That may all be true, but it doesn’t mean she wants to be his real girlfriend, nor does it mean she should feel obligated to do so, grandma angle or not.
This isn’t a matter of her not being honest with her feelings or stubborn in giving into them, but a matter of her having a good thing going with her rental business and not wanting any boyfriend at the moment.
I initially assumed she had the job so she wouldn’t be a financial burden on her family. But the fact she mentions she’s a low on funds suggests she’s paying for something expensive and important to her (either that, or maintaining her girlfriend persona is an expensive business, which it most likely is).
For all the sides of Chizuru we’ve seen, there are still things we don’t know. As a new character is introduced next week, I hope we don’t lose sight of her.