Prince of Tennis: The National Tournament OVA Episode 4 English Subbed Episode Title:Kikumaru Alone.Episode Description:Kikumaru plays Singles 2 against Kai from Higa. During the game, it is shown how hard Kikumaru had trained to raise his stamina. His lateral movement has improved so much that it looks like there are two Kikumarus. This motion is called Seal Step, and it looks as if he has a doppelganger.