1:10 at the first chorus is actualy kanata and rina duo,emma and kasumi doing the background vocal So as well at the 2nd chorus emma and kasumi duo,kanata and rina doing the background vocal Corect me if i wrong
1:10 Kanata & Rina --> Main singing 1:25 Kanata & Rina --> Main singing 2:31 Emma & Kasumi --> Main singing 2:45 Emma & Kasumi --> Main singing 3:14 Kanata