 He is also one of the 14 middle schoolers to represent Japan at the U-17 world cup.Despite the fact that he's not the captain of the middle school representatives, Oishi represents the Japanese U-17 team as a whole on the world stage, drawing lottery slots to determine the team's initial positions for the tournament.In the Prince of Tennis Musicals, Oishi has been portrayed by Yuichi Tsuchiya (2003-2005), Hiroki Suzuki (2005-2006), Yukihiro Takiguchi (2006-2007), Yuya Toyoda (2007-2009), Yuki Tsujimoto (2008-2010), Jin Hiramaki (2010–2012), Ikkei Yamamoto (2012–2014) and Shun Ishida (2015-2016).