High school student Ayumi falls to her death shortly after telling her friends, Satomi and Yuka, that her 'boyfriend' wants to kill her. The girls investigate her suicide and quickly link her death to a popular cellphone dating simulation game called Keitai Kareshi. The main features of the game include a 'love gauge' that determines how well the player is faring and the ability to trade boyfriends with other players. There is a rumour spreading that if the gauge hits either 100 or 0, you will die. Satomi insists on downloading Ayumi's boyfriend so they can interrogate him about her death...

Umika Kawashima
as Satomi Ueno

Nozomi Maeda
as Eri Aikawa

Hideo Ishiguro
as Naoto Takahara

Yuka Ônishi
as Etsuko

Sakina Kuwae
as Kumi Saito

Shigemitsu Ogi
as Masaru Igarashi

Mari Hoshino
as Miki Asanuma

Motoki Ochiai
as Kaneda Masatoshi

Tsugumi Shinohara
as Aki Harada

Takuya Uehara
as Riku Sasayama