One Outs (ワンナウツ, Wannautsu) is a Japanese baseball manga series by Shinobu Kaitani originally serialized in the seinen manga magazine Business Jump from Issue 1998-24 to 2006-18. It was relaunched in Business Jump on October 1, 2008 until March, 2009, under the title One Outs: The Suspicion of the All Star Game War and spanned 7 chapters, which where later released as Volume 20.
Kojima Hiromichi is the ace batter of the Lycaons - a notoriously weak baseball team that is often ranked at the bottom of the league. Determined to lead the team to victory prior to his retirement, Kojima takes a trip to a training camp in Okinawa, hoping to discover what factors the Lycaons lack.
Here, he happens upon a game dubbed "One Outs" - a gambling derivative of baseball - and is soundly defeated by a blond pitcher named Tokuchi Toua, who is claimed to have never allowed a hit in any of the 499 games he has played.
Kojima realizes that he has found the 'missing factor' and makes a wager with Tokuchi. Little does anyone know that the outcome of this gamble will dictate the fates of the Lycaons and all those connected to the team.