Deciding that they need to help with Sana and Nanaka’s relationship, the Wakatsuki twins suggest a trip for their entire group to Kotsuchi-kawa. Shuusuke is particularly looking forward to fishing and the spa they’ll be heading to afterwards. They go to tell Nanaka about it, but Sana accidentally steps on her compact when it rolls under his foot as he’s entering the classroom. He offers to pay her back for it, but Nanaka claims that it’s okay since it wasn’t an expensive item. Later that day, she sees Sana and Asami happily shopping together in a gift shop, however it’s not until the following day when Sana gives her a new compact that she realizes what the two were doing. Nanaka then agrees to come with them on the trip, and as she’s looking at her new compact, she remembers how she had made cookies for the last trip their entire group took when they were young, so she decides to make them again.
When the day comes, Nanaka is surprised to find out that Asami is coming along too, and to make things worse, Asami got the same compact. The six of them eventually arrive at the river, and Shuusuke tells everyone a story of how Sana had tried to start a campfire without matches or a lighter back when they were young. Shuusuke then gets ready to do some fishing, and Sana brings over the same lure that Shuusuke gave him as a present five years ago. He also still has the mitten that Shuri gave him, and Sana telling Aoi that he’ll always remember her cake reminds Nanaka of how Sana remembered the violin piece too. As for the actual fishing, Aoi gets her lure caught on the back of her dress, but Sana manages to catch one. However, he has an adverse reaction to the bloody knife that Asami is holding after she guts the fish. He’s able to regain some of his composure and finds a pretty pink stone in the riverbed, but Shuri still notices something wrong when she comes to get him.
Even though he eats a lot during lunch, Shuusuke is still ready for dessert, but before Nanaka can pull out her cookies, Asami presents them with a tart she made. Because of her timing, Nanaka doesn’t bring out the cookies after all. The group then heads to the spa, and Shuusuke and Sana find that Aoi and Asami look good in their different swimsuits, but to their surprise, Nanaka has to wear her school swimsuit because it’s all she has. They all have fun in the pools and slides, particularly Aoi, and as they’re sitting at the snack bar afterwards, Shuusuke brings up how Sana wore his wristwatch into the pool. Sana reveals that it’s waterproof, and when he refuses to take it off, Nanaka suggests that it’s pretty important to him and Shuusuke wonders if it’s a present from a girl. This leads to Nanaka suddenly getting up to go back to swim some more.
By sunset, the six of them have arrived back home by bus, and Sana, Aoi, and Nanaka part ways with the other three. It is at this point that Aoi brings up the cookies that Nanaka had brought on their trip all those years ago, and after Sana remembers how delicious they were, Nanaka finally admits that she made more. The three of them go to Aoi’s house to eat them, and despite Nanaka’s own lack of confidence in her baking, Sana finds the cookies delicious. He even says that they have the same taste as before. Once the entire batch is gone – most of it wolfed down by Aoi – Sana remembers the stone that he found and gives it to Nanaka as a thank you for the cookies. This makes her quite happy, and, as she’s playing with it later, she thinks about how it is the gift from Sana for only her.
It seems pretty obvious that Sana’s reaction to the bloody knife is probably a clue to his past. I don’t expect anything near School Days level of violence, but this opens the door to a death or murder or some traumatic event involving sharp edges. The wristwatch thing is probably a clue too, especially with the split-second shocked look that Sana had on his face when Shuusuke first brought it up. Maybe Shuusuke was right in guessing that it was a present from a girl, but the clues don’t fit together very well yet.
It’s almost surprising how quickly Nanaka has gone from being kind of hostile to the point where she’s really happy when Sana gives her a present and bothered at the thought of him with another girl. I really though it’d take longer, but at this rate, he could confess to her next episode, and she’d probably accept. That’s not likely to happen immediately, especially given that the preview shows the arrival of Hinako and appears to be more about Shuusuke, but the possibility is there, barring any big revelations that change everything.