Hirotaka and Narumi go on a normie date to a theme park, and Hirotaka takes the normie part very seriously, bringing along a piggy bank and fining Narumi whenever she uses an otaku reference or says something a yaoi would say. Never mind the fact that bringing a piggy bank to a date isn’t a very normie thing to do!
Hirotaka is doing this because he believes he won’t truly make progress in his relationship with Narumi until they can spend time as something other than otaku buddies. That is to say, he wants to see the same side of Narumi her other dates saw: the one actually trying to hide her otaku/yaoi sides.
The date proceeds normally, with both Hirotaka and Narumi incurring penalties for letting their true sides slip. Then they reach a haunted boat ride, and in her rush to get aboard, she ends up leaving the platform on a boat not with Hirotaka, but with Kabakura.
Turns out Koyanagi, who ends up in a boat with Hirotaka, made Kabakura take her to a theme park, because she heard Hirotaka and Narumi would be doing it and it sounded fun. Narumi has to cross her arms tightly so as not to accidentally hold Kabakura’s hand, and both are scaredy-cats.
Meanwhile nothing fazes Hirotaka or Koyanagi, though the latter can sense a bit of restlessness on the former’s part. He tells her not to worry too much about how fast things are progressing; it’s not often two people go at the exact same pace. There’s nothing wrong with taking things slow, and if that’s how things are going, there’s no reason to shake things up.
When the two couples meet up then part ways, Narumi and Hirotaka rest a spell on a bench, and Narumi scares the dickens out of Hirotaka by saying “this isn’t working” and “we should end this.” She’s not talking about their relationship, thank God, but about the piggy bank penalties. Once free to talk about otaku stuff, they both feel much more at ease.
She then gives Hirotaka a surprising gift: a pair of earrings. It turns out she too wanted to see a side of him she hadn’t seen before; in this case, the side of Hirotaka who wanted to grow up fast. While the looks of the show on the whole are pretty much average for the genre, the animators take their time on Narumi fiddling with her hair and Hirotaka suddenly pulling it back to reveal she’s wearing (clip-on) earrings too.
He leans in to what looks at first like a kiss to thank her, but it turns into a hug, albeit a tight and romantic one. He thanks her for the earrings, and admits he can be as childish as she claims to be. He had no reason to be concerned about them not going anywhere, or nothing changing, because they are…just at their own pace.