You and Rin were rivals on who would be a better swindler. There was a prom in Hyakkao Private Academy and you were partnered with Rin instead of your crush

Rin's movement while dancing with you was elegant but your focus was on your crush dancing with a girl...you were drowned of jealousy as you wished you were the girl. Your dance partner, Rin then lifted your chin to look at him instead of ur crush

“Focus on me not him~” He whispered to you, close to your ears with his signature smirk