Niimi was born in what is now Asakita Ward, Hiroshima City, in Hiroshima Prefecture, as the second son to a farming and soy sauce producing family.
Niimi was born in what is now Asakita Ward in Hiroshima Prefecture to a farming and soy sauce. This was as the second son. These farming and soy sauce were producing family. Asakita Ward was Hiroshima City.