Hirotaka and Narumi are not kids anymore, and the former is far removed from his “bad boy” days when he thought getting an earring and acting like an adult would help him become one quicker. In hindsight, he wondered what his past self’s big rush was; he’d much rather stay a kid. Being surrounded by games and toys from childhood certainly helps.
That philosophy works against Hirotaka the adult when he stays up playing games all night on a weekday, making him a virtual corpse at the office. It’s a downside, but at the end of the day a small price to pay for You Doing You.
Still, an unconscious Hirotaka is hardly interesting, so Narumi heads to the Starbucks for a grotesquely elaborate frappé she orders entirely in English, and the barista is a super cute! Not only that, they soon realize they actually know each other.
Kabakura and Koyanagi are also there. Kabakura, who’s always carried a torch for Narumi, is stunned by Koyanagi’s assertion that the blond kid is likely an exe. But while Koyanagi tries to take the high road and stay out of it, her and Kabakura start feeding off each other with increasingly hypothetical theories.
Then Koyanagi texts Hirotaka to come, and she and Kabakura learn the truth is somewhat more mundane: the blond kid, Naoya, is Hirotaka’s 19-year-old little brother.
Naoya asks to stay at Hirotaka’s (it’s closer to his college), and Narumi extends the invitation to the whole gang. Soon, the core quartet has dropped its guard and starts talking about obscure things Naoya doesn’t quite understand because he’s a normie.
That normie-ness is borne out by an evening of complete gaming ineptitude (while Hirotaka, ever the big brother, simply plays as though Nao isn’t his partner and wins anyway, before passing out again).
When the time comes for everyone to head home, Nao offers to walk Narumi to the station, and Kabakura springs to attention, warning him she already has a girlfriend. Even I slightly suspected that Nao was using a pure-and-innocent act as a front for his playboy-ness, especially when he acted dumb about what he was doing.
However, after Koyanagi leans in to kiss Kabakura and explains the relationships in the room, Nao demonstrates he really is that pure and innocent. He breaks into tears not because he’s lost Narumi to his brother, but because he’s so happy his brother has somebody, and always hoped that somebody would be Narumi.