Michiko lost her dad in a car accident when she was 10 years old. After the car accident, Michiko has lived with her mother Kyoko. Michiko, now in her 2nd year of high school, gets a cell phone from her mother as a birthday present. Michiko is so excited to have her very first cell phone. Soon afterwards, she is forced into joining social networking site "AvaQ" by classmate, and queen of the classroom, Taeko.
Misaki receives an email from a friend who had supposedly died when they were younger. She investigates and finds a scientist who uses the "Ghost System" to contact spirits.
Ever since bike messenger Junya lost his pro cyclist father in a traffic accident one year ago, he's spent his days in lethargy. While out on a delivery, he spots a man, Shintarou, considering jumping from the roof of a building. By chance, the two meet later on after an accident caused by Shintarou sends Junya to the hospital. From there starts the story of their ill-fated friendship.
