The events of the game are set in the future. The Galactic Police discovers that a scientist named Cronus has conducted genetic experiments on human beings. The police chief rescues three little girls, each one of whom bears the traces of these experiments. Fast-forward fifteen years: the three young women - Saki, Lilis, and Ariel - now work for the Galactic Police, determined to find out the truth about their origins and the nature of experiments. They are sent on three dangerous missions - missions they might not survive...