OVA Vol 4 Storyline

Ep 6: Koroshiya to Yobareru Otoko (The Man Who's Called The Killer)
It is now the final match in the 2nd matches against Higa Junior High where Seigaku's captain Tezuka Kunimitsu finally makes his appearance. He is drawn into a battle of pride with Higa's captain, Kite Eishirou who uses his physique, body balance and "Sokuchihou" to his advantage. Kite goes to extreme measures and even resorts to dirty tricks so as to win which leads Tezuka to enter into the region of "Muga no Kyouchi" and use the techniques of Kite's Higa teammates against him. As Kite is forced into a corner, he tries again to turn the game to his favour by resorting to underhanded means...

Ep 7: Beach Volley no Oujisama!?
After a tough match against Higa, the members of Seigaku prepare for the next match by heading to the beach for a training camp. They happen to meet Rokkaku there and both teams decide to hold an impromptu volleyball tournament with their elderly coaches joining in too. The duo who loses will have to drink Inui's new creation, "Iwashimizu" which makes everyone try very hard to avoid this terrible punishment...