Harunobu Nikaidou

二海堂晴信, Nikaido, Bodoro, Bou
Reis selfproclaimed best friend and lifelong rival. A fourdan he has played with Rei since they were children. Even though he might appear to be healthy he is in fact in poor health. He is from a good family. He is modeled after reallife shgi player Satoshi Murayama. Source: Wikipedia