Kyosuke Tsutsumi spots a beautiful girl and tries to photograph her. Hiro Hirono meets the beautiful Miyako Miyamura when she steals his bike in pursuit of a purse thief. Renji Aso encounters the mysterious Chihiro Shindo at an abandoned train station.

Kyosuke questions his ability as a photographer. Hirono spends the day with Miyako. Chihiro reveals to Renji that she has a memory defect that only allows her to remember the last thirteen hours.

After getting a significant amount of work done on the novel, Renji and Chihiro go for a walk on the beach where a misunderstanding causes Chihiro to run away in tears. Kei further sabotages Miyako's relationship with Hiro.

A depressed Renji reflects on his memories with Chihiro and begins to collect her missing diary pages. They meet again at the train station. Yuko and Yu reunite at the old church, and all is well for the other couples.

A flashback is shown with Yu, Yuko, and Kuze in their younger days as high school students. At this time, Yu and Yuko have not seen each other for ten years. In the present day, Mizuki is staying over at Renji's for the time being until she enters high school, and does not have much to do while Renji studies for exams. Renji's mother introduces Kuze to Mizuki, who discovers some of the things Renji was trying to warn her about him might be true. Mizuki and Kuze spend the rest of the day together, and the two become more familiar with each other.

In the past, Yu finally comes to terms with his love for Yuko, but must turn down Nagi first. After Kuze plays his violin for Yu and Yuko, Yuko starts crying because the music is so beautiful and runs out of the room; Yu chases after her to the school roof. There, Yu professes full devotion to Yuko, and she finally reveals to him what she has been hiding this whole time. Her older adoptive brother has been physically abusing Yuko for years, and she infers that this could have all been avoided had Yu merely said he wanted a younger sister back when they were at the orphanage together.

In the past, Yuko and Yu are now living together again. Yu is getting drawing lessons from Nagi. Yuko meets an orphaned girl named Miki, who was intended to commit suicide with her parents. Soon, Yuko and Miki become friends. Miki meets the young Kuze, and Kuze gives her his green ribbon, which he uses to tie a side ponytail on her. Yu and Yuuko decide to meet after Yu's work on Christmas, but before Yu gets there, Yuko gets into a car accident. By the time Yu and Miki arrive, Yuko is already dead. Yu remembers that Yuko gave him the key to the school roof to keep for safe keeping, and how she said to give it to anyone who is sad or lonely.

Everyone is spending time with their loved ones during Christmas, whether in Japan or Australia. Kuze survived the surgery and continues to live on with Mizuki. Yu hears from Nagi that Hiro said he talked with Yuko, and Yu heads back to Japan to meet up with her in the church. The two spend the rest of the night together, first at the church, and then at the school's roof to watch the sunrise. Yu and Yuko say their goodbyes and Yuko disappears, leaving behind a white feather.