It’s Summer Vacation, which means, presumably, that Nishikata won’t have to deal with Takagi’s teasing. But one can never presume when it comes to young love, as Takagi and Nishikata end up spending a lot of time together despite not being beholden to it by school schedules.
When Takagi proposes the two of them practice tandem riding during the summer, Takagi might bristle, but he doesn’t refuse. After all, while he’d probably never admit it he enjoys her company, and not just for the challenge of trying to best her.
Because Nishikata can’t pull off the tandem riding on the first day, he owes Takagi a juice, but can’t afford one of his own. Takagi first offers a sip from her can, which would be an indirect kiss, but then buys him a juice with her own change, because more than wanting to tease him, she wants him to be hydrated.
After a rainy day during which only the class president does her homework, Nishikata is late for his “appointment” with Takagi, and when she arrives, she’s in such a cute summer outfit he hardly recognizes her, so used he is to seeing her in her sailor fuku.
But there are too many puddles in their practice lot, so Takagi proposes they hang out anyway by doing a test of courage in a nearby “haunted” tunnel. Predictably, Nishikata falls for a number of pranks Takagi all too easily executes, capitalizing on the fact he’s scared even though he insists he isn’t.
Once they emerge on the other end, two young siblings passing by spot them and the sister deduces Nishikata and Takagi are another couple having a date. Which, sorry Nishikata, you kinda are. Sucks to be you! Oh wait, no it doesn’t.
The next day Nishikata doesn’t expect to see Takagi, who is on a family vacation. But when he spots her in the road (in another adorable outfit) he attempts to follow and surprise her, only for her to spot him first and devise a countermeasure.
She succeeds in scaring him, but more importantly, she wants to know what he’s up to, and since they’re both going shopping, she makes it another “date.” However, she did not expect a cicada to be under her hat, and almost falls backwards; Nishikata tries reflexively to catch her, but trips and falls himself, skinning his knee, while Takagi managed to regain her balance.
The caring Takagi comes out once more, insisting Nishikata wash the wound at a water tap. She gives him her personalized handkerchief to tie around his knee (thereby literally marking him as hers), then slips off her sandals and soaks her feet in the tap, inviting Nishikata to join her.
Nishikata had been having the “worst summer vacation day”, but Takagi counters his assertion by saying she’s having a good one because she got to see “a certain someone.” Lady, just tell him you got to see him. Either that, or fall for someone less dense!