In the park, in the gentle snow, Yukino submits her request to Hachiman and Yui, a request non-readers have been waiting to hear for five years. When Haruno once asked her if she even has a “self”, Yukino pondered an answer and found the results disheartening. She wants to find that self, a self that isn’t following in the footsteps of Haruno or her mother.
While she’s enjoyed faux independence to this point, now she seeks the real thing, even when it means moving back home. Her request, then, is for Hachiman and Yui to support her in her efforts. They accept, walk with Yukino back home, and encounter a tipsy Haruno. Yukino wastes no time getting things moving, telling her big sis they need to talk.
The next morning, Hachiman stows Yui’s much-improved cookies in his desk and greets Komachi, who has already made him breakfast and is preparing for a strenuous day of interviews for entering high school. Their semi-antagonistic banter may feel a tad performative to an outsider new to their interactions, but that’s mitigated by the fact the banter flows so organically and is studded with moments of genuine sibling affection.
While waiting for Komachi to meet up with him for some shopping, Hachiman runs into Kawasaki Saki and her own imouto, Keika, who’s a lot younger than Komachi. Saki remarks how Hachiman is so used to spoiling his little sister, he’s totally unaware he’s doing the same to hers. Then again, at a time when Komachi is growing up fast—entering high school, ye gods!—Hachiman is happy to pamper a little sister without pushback.
Hachiman brings up Saki’s brother Komachi shows up, elated and hyper, then when Komachi arrives, Saki observes more of their brother-sister banter. Considering her extreme reaction to Hachiman’s offhand “I love you” during the cultural festival, and her reactions to Hachiman here, I wouldn’t be surprised if she’s developed a teensy little thing for him.
From there, Hachiman and Komachi go on a multi-vector shopping trip, though Komachi earlier remarked that any attempt by her bro to call it a date was “creepy”. Still, the two clearly have a ton of fun flitting from one place to another, culminating in buying groceries for dinner, which Komachi prepares after doing all of the house chores without Hachiman’s help.
These are all efforts by Komachi to make up for slipping in her chore duties during her high school entrance prep. Hachiman never made a big deal out of any of it, but the fact Komachi wants to make it up to him, and he doesn’t resist, says a lot about how much their relationship has improved even as the two go through such major changes in their lives. She then kneels, bows, and formally thanks her brother for taking care of her to this point; she’s to a large degree the person she is thanks to his care and love.
Like Yukino, Komachi doesn’t want to be pampered and spoiled forever as she ends up following a pre-determined path. The two women seek to strike out and prove to themselves they’re capable enough stand on their own and choose their own road to travel, while still accepting moral and practical support from their family and friends.
Hachiman can’t help but tear up over Komachi’s mature display. Rewarding days, months and years lie ahead as Komachi will continue to make him proud…but his days of wiping chocolate from her face are over.