Almost a year after they started dating, Junichi and Ai are reflecting over their time together at the beach. With Junichi studying at a cram school and Ai tending to her responsibilities as captain of the swim team and at home, they are spending less time together, though they are looking forward to their date on Christmas Eve. One morning, after Junichi studies too late, Ai goes to wake up Junichi and walks with him to school as they pass by Ai's teammates. After spending some time at the library studying, Junichi decides to visit Ai, only for the swim team, which includes Miya who recently joined, to reprimand him of his actions. Soon after, Junichi finds himself sleeping at the infirmary after another late night study session. Ai decides to visit him as Junichi asks her to let him sleep on her belly while singing him a lullaby. As Christmas Eve approaches, Junichi runs into a problem when he accidentally marks the answers in the wrong spots during a practice test at cram school and thus has to take a training camp which starts on the 23rd of December, canceling their plans for their date. Ai reassures him that she will be fine but soon becomes depressed as they are barely spending time due to their responsibilities. Some time before Junichi leaves, Ai decides to give Junichi a present to help encourage him during his training camp. However, Miya tells her that because of his bad score, the cram school took him away earlier than projected, leaving Ai to wander the festive streets alone without her boyfriend.
昨年の創設祭から付き合い始めた純一と逢。純一は大学受験のために塾に通い、逢は水泳部の部長となり、お互いに忙しい日々を送っていた。それでもなんとか創設祭が行われるクリスマスイヴにはデートをしようと準備をしていたが、純一は塾で行われた模試でケアレスミスが原因でひどい点数を取ってしまう。その結果、純一はクリスマス前から合宿につれていかれることに…。
Un año después de que comenzaron a salir, Junichi y Ai están reflexionando sobre su tiempo juntos y haciendo planes para Navidad. Con Junichi estudiando en una escuela intensiva y Ai atendiendo sus responsabilidades tanto como capitana del equipo de natación como en su casa, pasan menos tiempo juntos, aunque esperan con ansias su cita acordada. A medida que se acerca la víspera de Navidad, Junichi se encuentra en problemas y tiene que tomar un campamento de entrenamiento que comienza el 23 de diciembre, cancelando sus planes para su cita. Ai le asegura que estará bien, pero pronto se deprime ya que apenas pasan tiempo debido a sus responsabilidades. Antes de que Junichi se vaya, Ai decide darle un regalo para ayudar a animarlo durante su campamento. Sin embargo, Miya le da una mala noticia que la termina afectando.
사귀기 시작한지 어언 1년, 타치바나와 나나사키는 1주년이 되는 크리스마스 이브에 큰 기대를 품고 있었다.
하지만 타치바나가 형편없는 모의고사 성적 때문에 강제로 학원 합숙에 소환되고 만다!
졸지에 생과부가 된 나나사키는 과연?
Près d'un an après le début de leur relation, Junichi et Ai repensent au temps qu'ils ont passé ensemble à la plage. Junichi étudie dans une école de bachotage et Ai s'occupe de ses responsabilités en tant que capitaine de l'équipe de natation et à la maison, ils passent moins de temps ensemble, bien qu'ils attendent avec impatience leur rendez-vous de la veille de Noël.
