Shimamura calls Adachi to ask if she can do a sit-up. It’s a weird and random conversation, but who cares? They’re enjoying talking on the phone together; the content doesn’t matter. Then Shimamura goes to the gym with her mom and encounters Adachi’s mom talking about her daughter.
Shimamura can’t stop herself from speaking up for her friend, questioning whether her mom really knows what she’s talking about. Mirroring her own mom’s tendency to act younger than she is, Shimamura ends up challenging Adachi to a sauna duel to determine who is right.
While Adachi’s mom is initially hostile, she admits she doesn’t know what’s going through her kid’s head. She just wishes she did. In this, the two are alike. When asked for suggestions on how to be a better mom, Shimamura says she should just be normal: have dinner with her once in a while.
Adachi’s mom ends up doing just that, which Shimamura learns as she’s resting her head in Adachi’s lap. Turns out this was odd enough behavior from her mom for Adachi to be too anxious to taste the food her mom made. Shimamura snuggles closer to Adachi, who is demure. Then they do sit-ups!
Shimamura reaches out to Adachi to hang out with her and her friends at karaoke. Shimamura’s mom raised her not to be a burden to others, but it’s Adachi who feels she’ll affect the “harmony” of Shimamura’s three-girl group. Shimamura insists that won’t be the case, and Adachi agrees to the date.
When Adachi arrives on her bike and spots Shimamura’s cute outfit, the two look like a perfect couple. Shimamura’s other two friends are warm and friendly to Adachi, but things still feel “off” to her. She senses that while Shimamura is better at social situations, she doesn’t like them anymore than Adachi.
The two sing a beautiful duet and then prepare to head home, but Adachi offers to give Shimamura a ride on her bike, and Shimamura accepts. Adachi is blushing the whole trip, completely on top of the world to have Shimamura behind her, her hands on her shoulders.
Shimamura suggests a detour to a nearby playground and buys them drinks. Earlier, while underwater in the pool, the vivid aqua color reminded Shimamura of Adachi’s favorite brand mineral water, but the machine closest to them didn’t sell it.
When Shimamura finally draws close and asks Adachi if she has something she wants to talk about, Adachi is initially silent. After all, there isn’t just something she wants to say; a great number of things have piled up inside her, but she’s held them all back for fear of making things “weird” between them. Even so, something comes out: “I want you to pat my head.”
Adachi thinks she’s totally blown it, but then Shimamura pats her head! She pats it slowly and gently, and Adachi has never been happier. Shimamura again notes that Adachi likes to be coddled, and while that’s true, her little request shouldn’t be taken to mean she wants a Big Sis. She wants to be someone special to Shimamura…even if it’s weird.
That head-pat all but clinches it for Adachi: she must like her. Rather than let Shimamura toss her empty off-brand drink can, Adachi keeps it as a memento of that moment of clarity. If Shimamura ever ends up in that room, maybe she’ll see it, and understand. And maybe laugh, too…but good-naturedly!