Akane
Akane is a girl who died of a sudden heart attack during a radio show in the old school. Since then, her ghost curses all those who hear her voice and they will die at the sunset of the same day. She was sealed in the microphone by Satsuki's mother, Kayako. But after many years, the microphone in the old school building was broken and Akane was released. Spoiler Satsuki puts her into spiritual sleep by repeating the number four several times (in Japanese culture, "4" is an unlucky number, because "shi", the word for four, is also the word for death), with Hajime finishing the process by ringing the bell that announced the end of the radio transmission.