Shizuru Furuhashi (古橋 静流, Furuhashi Shizuru?) was the wife of Reiji and the mother of Fumino.


Shizuru had average length blue hair in her youth, which grew longer she got older and her appearance was quite similar to Fumino. Her eyes are brown.


Though much of Shizuru's personality is unknown, she was shown to be a very loving and supportive mother to Fumino and wife to Reiji.

She often looked at the stars with her daughter and taught her the names and meanings behind them, which sparked Fumino's goal to become an astronomer.

It is later revealed through a video recording she left on her laptop that in her high school years, she was embarrassingly bad at mathematics, similar to her daughter. Despite this, she was able to improve through her hard work. Interestingly, she considers herself "an ally of the incapables", similar to Nariyuki.


During her school years, Shizuru was laughably bad at mathematics despite her desire to become a mathematician. Although through her efforts, she was able to overcome this difficulty and her grades on the subject improved.

Sometime after graduating from high school and enrolling in a university, she met Reiji. During her college years, Shizuru was regarded as a genius in mathematics and this status eventually followed her up to when she and Reiji became mathematicians, winning her numerous accolades for her ability to solve many difficult mathematical problems, even Millennium Prize Problems, thought by Reiji. At some point, she and Reiji fell in love with one another and got married, leading to the two to have a daughter that they named Fumino.

Shizuru then suffered from an illness that tragically resulted in her death when Fumino was only a child.


  • The name Shizuru means "quiet" (静) (shizu) and "flow" (流) (ru).
  • Shizuru's surname Furuhashi means "old" (古) (furu) and "bridge" (橋) (hashi).
    • Her maiden name was Fumizuki (文月), which is revealed on Episode 23 (anime only), which means "sentence" (文) (fumi) and "moon" (月) (tsuki/zuki).
      • Her surname is also spelled "Huruhashi" on the trophy from a foreign award [1].



  • Shizuru and Reiji studied mathematics in university.



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