About Nikaidou, Harunobu
Rei's self-proclaimed "best friend" and "lifelong rival". A fourth dan ranked Shogi player, 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 actual real-life shogi player Satoshi Murayama.
Source: Wikipedia
Anime Appearances
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Nikaidou, Harunobu
Okamoto, Nobuhiko voices Himmel here
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Pretty Rhythm: Aurora Dream