While informing Nagi the bath is free, Sachi’s towel slips off, but in a nice subversion of the trope, Nagi isn’t awake to see anything. Sachi, however, sees one of Hiro’s texts on his phone, referencing a d-d-d-date. The next morning, Erika finds Nagi all dressed up and ready to go. Nagi meets Hiro resplendent in comfy casual clothes, and is excited for their date, but also expects it to be another shrine stamp-collecting affair.
So he’s surprised to find Hiro has taken them to an amusement park. She usually goes alone, so it’s significant she’s bringing him along. Yes, she is doing it in part for the couples discount, but also because she believes Nagi can “keep up” with her. That proves mostly true, as Nagi accompanies her on every heart-racing ride again and again, and even accidentally kisses a reflection of her in the hall of mirrors.
Back home Erika finds Sachi texting curses to her brother and confirms that he’s on a date with a Hiro-chan, appreciating that Sachi feels like the other girl is taking her brother away. Sachi is also upset he’s out on a date when he’s engaged, calling it “indecent”—something Erika never considered as she never planned to actually marry the guy. No Nagi around affords the biological sisters another opportunity to hang out, as Erika tags along when Sachi goes on her usual de-stressing trip to the batting cages and public bath.
Nagi returns home having felt like his date with Hiro was a “disaster”, but he’s way overreacting. There’s nothing wrong with a girl saying she thinks you’re “cute”, and it’s obvious she had a lot of fun by the way she was humming when they parted ways. A few hours later, at three in he morning, Nagi and Sachi’s dad (and Erika’s biological dad) arrives at their door, saying they’re all going fishing.
Turns out this is a tradition for both Nagi and Nagi’s dad, though Nagi always gets seasick and always says he has a terrible time. His dad though, has always picked times when he knew Nagi was down, and there’s nothing like fishing to take you out of a bad place and into a better one. While Erika and Sachi compete for the biggest catch, Nagi admits to his dad that he “doesn’t hate” his life right now.