Source 1 :
After losing his match to Kaga by half a point, Hikaru is given two choices: play Go on the Middle School team squad, or jump in the icy river. Hikaru decides to play Go, but when he is able to replay a game from memory, Sai begins to realize a great potential could be inside, a potential as good as that of Akira. Will Hikaru let Sai play as his skills develop?