Instinto de Caza. Helga era una cazadora, un lobo, un depredador, era puro instinto… Arnold, era un manso corderito, por fuera y por dentro. Pero eso cambiaría… porque debajo de ese suave exterior dormían los instintos. Y cuando ella buscara despertarlos, desataría algo que no podría controlar. Ella sería la presa.

With the new releases of the Vocaloid series, the older generation has been forgotten and discarded. Despite being thrown away, Kaito somehow re-awakens with a much more humanoid mind, but his vocal mechanism has been removed. When one of the newer, more "human" Vocaloids, Len, finds him on the street, what will become of Kaito's second chance at life? KaitoxLen in later chapters.