What is the secret trick of Prince of Tennis Nakakumaru Eiji?

Kikumaru Eiji: dance volley (water volley, etc.), Kikumaru beam, Kikumaru bazooka, Kikumaru footwork, left and right sprint (you can see Kikumaru using it in the later part of the manga and the fifth episode of the OVA animation) This move makes it possible for two people to play doubles alone! The name of Kikumaru's singles is unknown)