Matches against the first string's No. 11 through 20 begin. Yanagi faces off against No. 17 Mitsuya. To Inui's surprise, he calls Mitsuya "Akuto-niisan." Mitsuya is the man who taught Yanagi Data Tennis when he was younger. Though it's a battle between two powerful Data Tennis players, Inui senses something is off when he sees Mitsuya toying with Yanagi...
Meanwhile, Momoshiro and Kenya battling the No. 18 Hira and No. 19 Hara Shitenhoji OB doubles team find themselves struggling against their opponents' unique rhythm.
