She is the second lady to have her portrait used on a banknote, after the Empress Jingu (the one-yen note of the Empire of Japan was issued starting in 1881; the Empress's portrait was pure fiction).
女性としては神功皇后（大日本帝国政府紙幣；壱円券は1881年発行開始；肖像は全くの創作）以来の採用である。