Zack is currently in 8th grade, but is studying for a test to skip 8th grade. He's lived alone his entire life, but, Principal Celestia wants someone to watch over him while he stays at Canterlot High. And so, he got three girls, who absolutely love to sing to him. The only problem? He doesn't feel himself when he is sung to. And so, Zack will be spending the next four years with 3 Sirens who live with him.