Kagen

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. (imdb)

High school student Ayumi kills herself and leaves behind a cryptic message that says "will be killed by boyfriend." (imdb)

Idol-loving Kazuya is obsessed with digital idol Akane, who appears in the smartphone-based cute girl training game 'Idol Plus'. One day, her classmate Kyoko asks her for advice. Kyoko wants to delete Idol Plus.

A series of murders occur where girls are killed but the criminals are also killed, making it difficult for the police. However, the only thing they know about them is that it has to do with a game about a virtual girlfriend named Erika.