High school student Ayumi kills herself and leaves behind a cryptic message that says "will be killed by boyfriend." Ayumi's classmates Satomi and Yuka investigate her suicide and quickly links 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 chat with other players. Satomi, Yuka download the game to their phones and begin interacting with their new virtual boyfriends. Soon after, Satomi shares the game with her co-worker who -- not long after the love gauge on her cellphone hit zero - dies from electrocution. Meanwhile, Yuka sends the game to her manager who turns up dead the following day following a mysterious accident. The mystery deepens as Satomi discovers the image of Naoto, a senior student whom Satomi secretly admired, on her friend Hisami's cellphone.

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

Uehara Takuya
as Riku Sasayama