|Season:||Kamen Sentai RiderRanger|
|First Appearance:||The Boys Fight Back|
|Number of Episode|
Hirohito is an ally of the RiderRangers.
When her uncle and aunt were killed, Nagako took in her cousins. She has helped them fight by teaching them, and has created their weapons and suits.
Nagako is very socially awkward, and spends most of her time in her lab creating new weapons. Unbeknownst to her cousins, she has been creating a third power suit.
- She is 45 years old.
- She is named after the Empress of the Showa era.