Cock Robin o Korosu no wa
One day, when Hidak Kishi goes to school with his close friend Kimiko, he notices a strange new song in his music player: "Who killed Coca Robin?" You never know, he starts the killer game, with him as purpose: Kok Robin. Fourteen other players (called "birds") compete to kill him, in exchange for his desires come true. However, one of the birds, Sedano Minami, seems to have other plans. To the confusion of Hidaki, she decides to protect it, but what is its ultimate goal? How will Hidak survive this deadly game?