Those ‘battles to come’ Izuko mentioned at the end of “Mayoi Hell”? They weren’t fought or shown in Part Two, “Hitagi Rendezvous”. Instead they remain just over the horizon, foreboding in their present invisibility.
“Rendezvous” is instead primarily interested in re-introducing Senjougahara Hitagi as a prominent figure in Koyomi’s life. Even though she’s kinda always been prominent in his heart and thoughts, we’ve seen so little of her since Koimonogatari that even she seems to be struggling with her character…which is pretty hilarious.
In any case, she’s saved up a ton of “points” that she intends to cash in on with a day-long date with her boyfriend (ending promptly by 7pm so she can have dinner with her father.) It’s also White Day, and they both graduate the day after tomorrow, so now’s the time to enjoy one last gasp of high school romance (before it becomes a college romance).
Ononoki is still hanging out in Koyomi’s house, given the mission by Kagenui to keep an eye on him until ordered to stop (and implying if Kagenui never returns to recind the order, she’ll stay by Koyomi’s side the rest of her life). Tsukihi’s cameo consists of her grabbing and walking off with Ononoki, claiming she’s her favorite plushie.
From then, it’s on to the date! Senjougahara has adopted a Hanekawa-style hairdo, and also acquired a driver’s license having aced her driving test on the first try. She also points out that until very recently (since his “return”) Koyomi has been unable to acquire a license, since as a vampire he wouldn’t show up in photos.
Senjougahara is not your cliched bad driving anime woman; she simply drives Koyomi safely and well without any drama to the first stop on their date: the planetarium. We and Koyomi first learn of her dream to draw the “perfect space map” of the celestial bodies that surround earth on all sides; such maps are shaped like a hand fan, which is also called…an ougi.
Having recently experienced string of action-packed days—dying, travelling to the depths of hell, exams—one can forgive Koyomi for nodding off while lying on the comfy beds below the planetarium dome. When he does, he dreams of Ougi, and Dream Ougi seems to be just as “real” as her physical version.
Instead of Senjougahara, it’s Ougi who shows Koyomi various constellations which match the animals that have represented the oddities/apparitions of his exploits. Shinobu is depicted as a Hydra, Hitagi a Crab; Nadeko the serpent.
Ougi also tells Koyomi she represents “the principles of the universe”, further tying into the fan-shaped map of the cosmos, and tells him of her duty to “eject” those who “break the rules.” They include Izuko, Shinobu, and the newly-resurrected Mayoi. And she hopes, for Koyomi’s sake, he “forsakes” them, thereby assisting her in correcting the mistakes of the universe.
With that, Koyomi wakes up beside Senjougahara (who also nodded off), and from there, they jump from place to place on their date, following up the educational planetarium and science museum with lunch, bowling, and karaoke, with Koyomi unexpectedly beating her in the latter two categories. As “punishment” for losing, Senjougahara walks arm-in-arm and even lets him princess-carry her back to the car.
Finally, after Koyomi admits he hasn’t been able to get Senjougahara a White Day gift, she parks the car by the waterfront and scolds him. But he can make it up to her by taking her hand in his and calling her by her first name, Hitagi, which he does, in one of the most genuinely moving romantic scenes in the entire Monogatari series—and they don’t even kiss! It’s all in the signature closeups and Saito Chiwa’s delivery.
After the credits, Koyomi finds himself alone in another dreamlike dark space with Ougi, who implies his date with Senjougahara was his “last”, or might well be, depending on the choices he makes. If he wants to be Ougi’s ally, he’ll have to help her fight Izuko, “the big sister who knows everything”, and avoid her apparent traps.
Koyomi begain Part Two with a monologue about how his story so far was one of self-preservation; preserving not only one’s life, but prioritizing his love for himself, to the point love with anyone else wasn’t possible. But since he fell for Senjougahara, he feels he’s been gradually losing his narcissism. So has that part of him taken the shape of Oshino Ougi, and is now fighting the “New Koyomi” who has come to love Hitagi more than himself?
Sadly, those questions, and the battles for which Koyomi must choose a side, will not be covered here;
this is the end of Owarimonogatari after just two episodes (Edit: apparently not)! But we can be fairly certain Koyomi won’t forsake Shinobu or Mayoi…and we’ll also see one of Koyomi’s inner thoughts—“to win there is an absolute need to lose somewhere along the way”—put to the test. Koyomi’s already lost his vampirism, for good and ill. Who or what will he lose in the final battle(s)?