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 investigates her suicide and quickly links her death to a cellphone dating simulation game called "Keitai Kareshi." The game distributed by popular mobile gaming site "Ice Cream" allows players to pick avatars and exchange messages with other players. A love gauge determines how well the player is faring. Satomi then downloads cellphone boyfriend Riku, which her co-worker Eri downloads onto her cellphone. Soon after, Eri dies from electrocution - not long after the love gauge on her cellphone hit zero. Yuka also downloaded cellphone boyfriend Masaya, which Eri sends to her manager Ishikawa. The next day, Ishikawa dies from 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.