world is mine

recently i found about the vocaloids; it's an application that uses computer algorithm to synthesize human voice. see how far our robotics technology have come to. and to attract younger generations, they made it into young adults and teen-aged vocaloids. I'm sure there are more, but I've only heard some songs by Ren and Kaito (boy type), and Rin and Miku (girl type).
the boy says

the girl says

then the girl says

then the guy says