When Nagi and Erika inform Sachi that she’s invited to their study training camp, she’s super stoked and can’t wait to start preparing for it. But when the group arrives at Erika’s opulent lakeside vacation home in Karuizawa, Sachi isn’t there; she’s ruled out by a sudden fever. In her place is Asuma Shion, AKA Matuoka Yoshitsugu’s Energetic High School Chum #1,478.
When I first learned of this, and how he weaseled his way into tagging along (why wouldn’t they have been able to go with no one replacing Sachi?) I let out a loud, drawn-out sigh. But Shion rather than Sachi being on this trip was actually a blessing in disguise. Instead of three girls vying for Nagi’s attention, Shion is vying for Erika’s while Nagi is stoked about being there with Hiro.
Nagi provisionally agrees to cooperate with Shion such that he lets him be Erika’s buddy for grocery shopping. At first Hiro thinks they should study while the other two are out, but the lake and crisp air of the countryside call to her. She parks herself out at the pier and does a magazine-worthy pose, telling Nagi straight-up she came because she knew he’d be there.
At the supermarket it becomes abundantly clear Erika has no idea what to buy, so she just buys whatever. Nevertheless, Shion praises her for having it together, and when she drops something, he swoops in to catch it, and his fingers meet hers. After flirting with Nagi, Hiro heads to the bath.
When Erika and Shion return home, the groceries they bought are nowhere in sight, but Shion claims to have confessed to Erika. When he actually tells Nagi that all he did was thank her for letting him come on the trip, Nagi tells him that’s not a confession. Then he tells Shion that he did confess to Hiro, and about the academic prerequisites for dating her.
Shion is impressed, calling Nagi “next-level” (the kid throws around a lot of pseudo(?) Gen-Z slang). When Erika rushes to the bath to talk to Hiro, it’s not about Shion at all (which is pretty funny) but the fact she forgot to pack underwear…or even a change of clothes. Honestly, between that and not bringing any food, you’d think Nagi would have noticed how light they were packing and prepared accordingly. Perhaps he wanted to give Erika the chance to do those things, since she’s trying to be more independent.
In any case, there’s no further mention of whatever food she and Shion bought, and we go straight to a nighttime test of courage. Hiro and Nagi are all set to be paired up again while Shion wants to go with Erika, but Erika suddenly declares she wants to be with Nagi, grabs him by the arm, and whisks him into the night, saying she needs to tell him “something”—probably about the family photo she hid when they first stepped into the house (likely the one that shows Erika and Nagi together as little tykes).
That leaves Hiro and Shion together, and it’s wonderfully awkward. Shion tries to help his buddy Nagi out by suggesting that Hiro doesn’t have to take the top spot in class every time, but Hiro immediately shuts him down, and changes the subject to Shion, whom she knows is trying to confess to Erika…and is willing to help him out.