Shinjin O (新人王, 'King of the New Stars') is a single knockout tournament in Japan sponsored by the Akahata (Red Flag) Shimbun, which is the newspaper of the Japanese Communist Party. The tournament was originally open to players 7 dan and below, who were 30 years old or younger. In 2006, it became the 'King of the New Stars U-25' tournament and the age restriction was lowered to 25 years old. Thinking time is 4 hours per player (3 hours from 2006), and the winner's prize is ¥3,280,000.
Since the end of Yamashita Keigo's record four win streak in 2002 (although Yoda Norimoto won five times overall), the tournament has been won by a different player every year. (From 2008, who had won the tournament can't participate again)
The 1992 Shinjin O final (lost to Komatsu Hideki) was one of the closest times Michael Redmond got to winning a professional tournament after his victory over Muramatsu Ryuichi in the 1985 Ryuen Cup young players' invitational, along with the 1997 North American Masters' Tournament, which he lost 0-2 to Jiang Zhujiu.
Although Ueno Asami's appearance in the final in 2021 was a notable achievement of women's Go in Japan, it was not the first time a woman had done this: Aoki Kikuyo did so in 1997.