Koizora tells the story of Mika, living a simple schoolgirl's life and the dramatic transformation that it undergoes when she meets Hiro, a student also at her school who is keen to call her his own. Mika was an average high school girl until she met Hiro during a scam to find her cellphone. They talk on the phone all through summer vacation and later succeed their relationship as lovers. Hiro has led a very different lifestyle from Mika. His ex-girlfriend, Saki, is jealous of Hiro's newfound love and arranges for Mika to get raped. Hiro is angry about this incident and promises to protect Mika whatever happens. Mika later gets pregnant with Hiro's baby and decides to marry him and have the baby. However, during a fight with Hiro's ex-girlfriend, the baby is gone. After that incident, Hiro dumps Mika and ignores her. Later Mika attends a Christmas party with her friend and college people. There, she meets another guy and they start going out with each other. Mika and Hiro meet at the place where they annually come to remember their deceased baby and Mika notices he is wearing a hat for the first time. The next winter, instead of Hiro, Hiro's friend shows up and tells her that Hiro is diagnosed with cancer, which was the reason he dumped her. Mika runs to the hospital and promises Hiro that she'll never leave him again. Her relationship with her second boyfriend ended there. Hiro and Mika have a wonderful time for a while, and sometime later, Hiro asks Mika to print out some pictures for him. While she does that, Hiro had a really serious situation and died while in a phone call with Mika. Mika runs and then she falls and the pictures she had printed scattered everywhere. Surprisingly, all the pictures were of Mika and she cries. Later, Mika tries to kill herself by throwing herself off a bridge, but a dove comes out of nowhere and she freaks out, causing her to jump backwards and ends up not killing herself. She was holding Hiro's journal, and the journal magically opened to the page where he drew a picture of him, her, and their baby. The movie returns to the present because all this was Mika remembering Hiro while in a train like maybe five years later. She meets her parents at the subway station and they leave.

* Mika - Yui Aragaki
* Hiro - Haruma Miura

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