Maika Hirai is a shy and timid schoolgirl. One day, a series of kidnappings occurs in the neighborhood. When Maika learns that one of her few acquaintances is a victim of the case, she enlists the help of her older childhood friend and admirer, Rei Tachibana, a genius researcher, and sets out to solve the case with the cyber gun "Cyan". The whole incident is unaware of Rei's meticulously planned trap ... ［BAD END］