Shinichiro Isumi Another insei friendly with Hikaru he appears to be doing very well in the first pro exam shown in the manga going undefeated until his match with Hikaru. During that match rumors about Hikarus incredible strength add to the pressure of time constraints and as a result he misplaces a stone his attempt to move the stone after letting go of it ends up with his resignation before Hikaru can accuse him of cheating. As a result he is defeated in his next two games and loses his chance to become a pro. He later learns to control his emotions and passes the next years pro exam without a single loss. Isumi also unknowingly helps Hikaru get over his loss of Sai when their practice game makes Hikaru realize that by playing he can find Sai within his moves the Go that Sai passed on to Hikaru. Isumis birthday is April 18th.