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Love forces two carefree youngsters to grow up in a hurry in this bittersweet coming-of-age romance from first-time feature director Natsuki Imai. Mika (Yui Aragaki) is a pretty but shy teenage girl who loses her cell phone and finds it a few days later, only to begin receiving calls from a secret admirer. Mika and the mystery boy finally meet a few weeks later, and when she sets eyes on handsome and mysterious Hiro (Haruma Miura), she's immediately smitten. The two quickly become a couple, but after Mika gives Hiro her virginity, his former flame Saeki (Asami Usada) decides to ruin her reputation at school, spreading lies about her past with other boys, and persuades three delinquents to sexually assault Mika. Hiro stands by Mika and displays a new willingness to show how he cares for her, but the young lovers face a new challenge when Mika discovers she's pregnant. Hiro is happy to marry Mika and raise a family, but their parents believe the teens are too young to deal with the responsibilities they now face, and their love is tested as they confront an uncertain future. Koizora (aka Sky of Love) was adapted from a popular novel for young people by Mika, which was originally distributed by a cell-phone network in Japan, reaching more than 11 million readers, and later went on to sell 1.5 million copies in paperback.