Narumi Ohsawa
Her sister is Maya Ohsawa (大澤摩耶, Saitama Prefecture female Go champion in 1991 and 2002, national female amateur Go champion in 2002 and 2013). She is a Go teacher at many places such as the University of Tokyo (東京大学囲碁銀杏会) and ANA Intercontinental Tokyo Go Salon etc.