Koizora (恋空, lit. Sky of Love) is a Japanese romance film and a drama series based on a "mobile phone novel" (ケータイ小説, keitai shosetsu) written by a young woman named Mika (美嘉).] The author has noted that Koizora is completely nonfiction.
The cell phone short story Koizora: Setsunai Koi Monogatari (恋空～切ナイ恋物語?) was written by Mika, with 25 million readers by the end of the serialization. It was later published as a novel which sold approximately 2 million copies. The film adaptation was released in November 2007, with a gross revenue of 3.9 billion yen, with 3.14 million people attending the theater. The DVD was released on April 25, 2008.
The short story was also adapted into a TV drama series, which aired from August 2 until September 2008, with a total of six episodes. From March until June 2008, auditions were held to choose the actor and actress for the two starring roles. Erena Mizusawa was chosen to play Mika, and Koji Seto as Hiro; there were a total of more than a thousand applicants. TBS broadcast the serial drama in prime-time, and the first audience rating was 5.6%.
Mika is an ordinary high school girl. One day, out of the blue, one of her classmates kisses her. His name is Sakurai Hiroki also known as Hiro. Hiro stands out because of his bleached hair and piercing. Apparently he is also dating someone. Mika is shocked and hurt that her first kiss had to happen this way. She desperately tries to forget about it. Then, her friend tells her that she should find somebody else and suggests Tatsuya, another boy in their class. However, before she even realizes it, Mika is already in love!
