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Third daughter of the Tsukishima family and talented pitcher.
Aoba is the third daughter raised by the Tsukishima family being a year younger that Koh and her older sister Wakaba. Seen as a tomboy by those who know her, Aoba has a strong love for the sport of baseball who was groomed by her father into being a talented pitcher when she was younger by playing catch ball. While Wakaba was alive, Aoba was jealous of the attention her older sister gave Koh and claims to hate him to this day as a result of the time he monopolized from Wakaba before her death. She also claims that she won't fall for a guy unless they are capable of pitching a 100 MPH (160 km/h) fastball. Despite not being allowed to participate in official games with men's baseball, Aoba provides pitching to both the middle school and Seishu baseball teams during their practices throughout the series and becomes more interested in the improvements in Koh's pitching to the point where she has faith that Koh could fulfill Wakaba's final dream of leading Seishu to Koshien.