As predicted, Yume knocks it out of the park with her festival yukata and hair, but it’s her who wants a picture of Mizuto in his the second she sees it. Instead, he snaps a pic of her, and happens to know her phone’s password.
In her thoughts, Yume admits to feeling considerably lighter after having a good cathartic cry. Now she can hold hands with her stepbrother without embarrassment, and mimics Madoka’s treatment of Chikuma by helping “steady” Mizuto during the shooting game.
Just when the fireworks are about to start, Mizuto disappears, something Madoka says he always does around this time. All of his relatives have told her to make sure to look after him, like he wouldn’t be able to “survive” without someone watching over him. But as she volunteers to go find him, Yume celebrates how she’s been able to see all these new facts of Mizuto since becoming family.
When they were merely in puppy love and dating, she idolized and glorified him, projecting her ideal of a BoyfriendTM without looking deeper. Meanwhile, while sitting alone at a shrine, Mizuto muses about how he considered the world of books to be the true reality, and the outside world a mere illusion.
The first thing in the world that felt real was Ayai Yume, who was also the first person to evoke the same sentiment everyone had for him: that he would not survive if left alone. That’s why Ayai Yume still occupies that “slot” in his heart that even Isana could never hope to replace.
Yume finds Mizuto at the shrine, and the two have the mother of all passive-aggressive verbal duels with one another, all the while happy they were on the same wavelength. She recounts the phone call they had that he ended abruptly, and she gathered that he called her from this very shrine.
Yume also gathered that Mizuto knew her phone code because it’s 1027, the day of their first kiss, a day they both remember with fondness. Then Yume asks Mizuto why he went out with her, and he says it really just amounted to her finding a seat next to his in a game of musical chairs.
Sitting side by side as the fireworks begin—the fireworks they never got to see together until now—what initially stirred in Mizuto towards Yume stirs again. A tear falls down his cheek before Yume takes his face in her hands and kisses him.
It’s her second first kiss, and with it comes a vow that she, Irido Yume, will eventually win him over, defeating Ayai Yume for that single slot in his heart. The next morning, and then back at school, the two are back to their playfully adversarial selves.
The happiness of the past will never leave either of them, etched into their souls as it is, and they will never feel that particular novel happiness ever again. But that doesn’t matter, because now that they’re both a little older, wiser, honest, and clear-eyed they can now achieve a new happiness; weave a new tale together.