Within the two weeks he and Erika are living together, Nagi apparently is able to study enough to ace the exams and conquer the legend that is Segawa Hiro. Both the nerds and normies salute him following through on his boasts. When Hiro again invites him to the rooftop, he should have known beating her at one exam wasn’t going to cut it as far as winning her over.
As far as she’s concerned, she’s still beating him in exams, 10-1, so his confession “will not be processed”. When she declares all the other ways she surpasses him when it comes to both studies and life, the two end up chasing each other around the school and messing up a classroom and panting on the ground. Hiro had fun, but she makes it clear there’s no way she and Nagi can go out. You see, she’s engaged too!
He has had so much fun, in fact, he’s surprised to learn that his time playing Erika has already come to an end. He says he appreciated having a place to “let off steam” and how it was fun overall; Erika said it was the worst, but he can probably tell she’s not being entirely sincere. But once he packs up his stuff and bows to the house, suddenly it’s all over, and they go their separate ways…
…Except Nagi returns home to find it dark and locked; turns out his family is temporarily staying at an inn while the plumbing is fixed. There’s no room for him at said inn, so it’s back to his birth father’s house…where Erika is still making herself at home. Turns out she wanted to have a go at living on her own without help. Nagi is surprised she wants to improve herself, and vows to help her become a “professionally independent person” like him.
When Sachi comes by to drop off some of Nagi’s stuff, she finally gets to meet her biological big sister, something both she and Erika are understandably nervous about. Despite Nagi saying how friendly Sachi is and how easily she warms up to people, their first encounter is extremely stif and awkward. Sachi later confides in Nagi that she’d looked up Erika on IG before, and finding out she’s even cuter in person threw her off.
Nagi commences “Operation Sister Besties” by getting the two to cook some karaage together. While Erika is a nightmare chopping cabbage, she gets to see Nagi and Sachi interact like a real brother and sister that they are, while Nagi gets to see Sachi and Erika very much acting similar…they even eat the same way. When he points this out, they protest his assertion…by heaping praise on one another.
Erika decides to interrupt dinner by having Sachi try on some of her clothes. With Nagi not around, Erika makes clear she has no intention of marrying Sachi’s brother, something that seems like a load of Sachi’s mind. They also exchange contact info. Back home, Sachi’s folks are irked that she went and hung out with Erika. This is rich for people who went behind both Nagi and Erika’s backs to set them up to be married!
Whatever Hiro’s deal is with her engagement, it seems like a hard stop in Nagi’s quest to win her heart. Nagi and Erika are living together again, this time indefinitely. Sachi has finally met her sister and Nagi’s fiancée and can’t help but like her, but how long these good vibes last is anyone’s guess. I’m surprised how much has happened just four episodes into a twenty-four episode series. Things have moved very swiftly, but there’s clearly a lot more in store for our cuckoos.