Akaza Naoyasu is a little known samurai, whose ancestral history is also obscure, but he is said to have some ties to the Fujiwara family. Naoyasu sent troops in 1590 to Odawara, and helped attack Oshi castle and Iwatsuki castle in Musashi. He and his troops also seem to have performed as a kind of escort for Kobayakawa Hideaki when he came into Echizen, and also for Horio Yoshiharu when he went to Fuchu.

For his efforts in these campaigns he was given 20000 koku in Echizen, but never had a castle of his own. His allegiances were untenable, fluctuating with whomever occupied the area at the time. Thus, when Kobayakawa Hideaki came into Echizen, Naoyasu sided with him, and when Otani Yoshitsugu came, Naoyasu likewise joined him.

In this way, at the time of Sekigahara, Naoyasu was still sided with Otani Yoshitsugu and was situated adjacent to him with a force of 600 men. However, once Naoyasu saw the traitor Kobayakawa Hideaki rush down the slopes of Mount Matsuo with his men towards Otani Yoshitsugu, he turned turncoat as well and attacked the latter.

Not surprisingly, this spur of the moment decision was not rewarded, and Naoyasu was dissolved of his holdings. He later served under Maeda Toshiie, who gave him 7000 koku and the commmand of Matsuto castle in 1601. He died a sudden death in 1606 while inspecting the flooded Daimon river when he was pulled under the current and drowned.