3x17 - Ace of Diamond

After their own semifinal game the nine Seido players watch Inashiro's semifinal against Teito. Narumiya and Mukai both played at Koshien Stadium as first-years, and then received their powerhouse school's ace number as second-years, and they'll both be pitching. Meanwhile, Seido High School is analyzing their game against Ichidai Third High, focusing on Coach Kataoka. Then, Miyuki remembers a certain thought...