S-?

A blonde anime girl in a blue uniform stands against a blue background, then the scene cuts to a red-haired anime girl in a purple uniform against a purple background, followed by a green-haired anime boy in a white shirt and black pants falling backward onto a green field while another boy watches, and finally, a video game screen shows a character in a battle with a large circular effect, with the text "KANSAS CITY SHUFFLE" and "with a double kill!" appearing on screen.