Die Gruppe wird plötzlich mit Nagase als Baby konfrontiert, das ist aber noch längst nicht der letzte Streich im aktuellen Spiel von Herzsame.
As the gang have to look after Iori who winds up as a baby, Yui is confronted by Chinatsu, who challenges her to a karate match and defeats her. Meanwhile, Yoshifumi ponders if his feelings for Yui are because of her similar appearance to Nana. On the second day of the New Year, Yui reverts to right after she was assaulted and, upon returning to normal, remembers vividly about that age. As Yui refuses to talk things out with Chinatsu, Yoshifumi tells her to stop running away from her problems. Talking with Taichi, Yui reveals her promise with Chinatsu was to meet each other at the national karate tournament, which she was unable to keep after contracting her androphobia, and laments how weak and reliant she has become. After sending Yui home, the others speak with Yoshifumi, who remembers his personal vow to live carefree and decides to go visit Nana to tell her about his love for Yui. Afterwards, Yoshifumi reconfirms to Yui that he loves her for who she is.
“時間退行”現象のために冬休みも人目を避けて過ごしていた太一たちだったが、
そんな折に唯は、中学時代の空手のライバル、三橋千夏と再会し、
空手を辞めたことについて、「わたしとの約束は？」と詰め寄られる。
また青木は、現象中に小学生になってしまったときの言動をきっかけに、
自分は本当に唯が好きなのかと考え込んでいた。
そしてそれぞれに悩む唯と青木は、ふとしたことから衝突してしまう。
Mientras que Kiriyama lidia con una amiga y una promesa que no puede recordar, Aoki elige a quien ama realmente.
唯在被三橋打敗以後對太一透漏自己逃避了與三橋的約定。另一方面，青木為了確認自己的心意，跑去見了菜菜…
