Before Yukino and Yui and Iroha, there was Totsuka Saika and Hiratsuka-sensei. Oregairu finally gets around to having some sustained scenes between these two and Hikki, but the fact they’re in the margins is proof that Hiratsuka-sensei’s gambit paid off, and Hikki has truly branched out socially. To that end, Hiratsuka-sensei seems poised to leave the school, while Hikki is disappointed Saika can’t find an opening in his schedule for a long-belated date.
Their chat is interrupted by Saki suddenly running out, and the two boys run after her. As expected, Komachi has passed her entry exam, and she collapses into her big bro’s bosom with tears of joy and relief. Saki is also pleased that Taichi passed, though she initially acts like she can’t believe it. When Taichi (re-)introduces himself, Hikki promptly tells him not to call him “onii-chan.”
The subject being a big brother (and having little sisters) is something on which Hikki has very strong and unwavering opinions. When Iroha comes to him hoping to get him to help her out with the prom preparations, he warns Iroha not to rely on Yukino, who doesn’t have the stamina for her workaholic pretensions.
Iroha labels Hikki as overprotective, like a big bro or even dad would be, but notes that no girl is “happy being treated like a little sister.” To Hikki, there is only one woman for whom he is a big brother, and that’s Komachi, because she literally is his little sister. Anyone who uses those terms for anything else needs to “repent”.
Hikki dispenses with Iroha’s notion that he’d one day try to flirt with her by stating “I can’t think of you as a little sister anymore”, and Iroha acknowledges it, albeit not with a little bit of her usual “polite-rejection” act. Iroha gets Hikki to help her out, but not because she’s his little sister.
It’s clear Hikki kept his distance from prom prep in part because Yukino really wanted to pull this off on her own, but there’s another more practical reason: he was out of the comms loop due to his virtual non-participation in social media. No matter; if he’s not clear what a “prom” is, Yukino, Yui, and Iroha are fully prepared to show him.
Yukino wants to film some marketing materials for the prom to be used both on social and the official school website. To that end, she’s fitted out the gym/auditorium in full prom regalia, while various boys and girls have been recruited to portray prom-goers dancing and having fun.
This also means dressing the part, and Yukino, not wanting to tax a potential prom king, decides to portray the king herself, in an a suit and tailcoat that’s dapper all get out! I LOL’d at Hikki describing his reflection as a washed-up pianist, but Yukino’s adjustments of his cufflinks and handkerchief make a big difference.
And then there’s Yui, whose gorgeous black-and-white dress is being adjusted by Saki and who does her makeup like this is the real thing. She even feels too self-conscious when Hikki is staring at her intently, but once they’re out on the floor, the lights go down and the music comes up, Yui gets some genuine giddy joy out of this dry-run practice prom, because at least for a few lovely moments, she’s in the arms of the man she likes.
As for Hikki, when the lights turn from blue to red, the music bpms go up and the dancing get more playful and primal, he stands off from the crowd. Now he gets the gist of the prom…and that it’s just not his thing at all! I don’t know how or even if the real prom will resolve the Hikki-Yukino-Yui triangle, but on the matter of Yukino Gettin’ Shit Done, it’s mission accomplished so far!