- Died: 1576
Naomasa was a noted retainer of Hatano Hideharu and held Kuroi castle. He was known as a capable warrior and bitterly resisted Akechi Mitsuhide's attempts to gain a foothold in the Hatano domain. When Kuroi was finally surrounded in 1576 and sure to fall, Naomasa is said to have given into the custody of Wakizaka Yasuharu a rare sable pelt which was a family heirloom. Naomasa then committed suicide. A branch of the Akai eventually became retainers of the Todo house.
- Initial text from Sengoku Biographical Dictionary (Samurai-Archives.com) FWSeal & CEWest, 2005