Privately sponsored Japanese under-20 championship. In its second term in 2005, Iyama Yuta (4d) (W) beat Ko Iso (4d) in the final. More details in this Nihon Ki-in news report.
It is not clear who this tournament was open to: pros, amateurs, both, or only pros of a certain institute. However, in a later Nihon Ki-in report (12 September), it was implied that this tournament was not considered a pro title by the Nihon Ki-in.
|1st||2004||Seto Taiki 5 dan||Ohashi Hirofumi 3 dan|
|2nd||2005||Iyama Yuta 4 dan||Ko Iso 4 dan|
|3rd||2006||Iyama Yuta 7 dan||Xie Yimin 3 dan|
|4th||2007||Iyama Yuta 7 dan||Ko Iso 7 dan|
|5th||2008||Ri Ishu 4 dan||Murakawa Daisuke 4 dan|
|6th||2009||Murakawa Daisuke 5 dan||Shida Tatsuya 3 dan|
|7th||2010||Murakawa Daisuke 5 dan||Shida Tatsuya 3 dan|
|8th||2011||Suzuki Shinji 3 dan||Terayama Rei 2 dan|
|9th||2012||Ichiriki Ryo 2 dan||Son Makoto 2 dan|
|10th||2013||Kyo Kagen 1 dan||Hirata Tomoya 3 dan|