In 505 DR, Aga settled in Kurojo castle in Kuroi-joshima and from there terrorized the inhabitants of Miyama Province, not wanting to rule but only to gain special privileges. At his whim, he sent destruction and death.
Finally, in 528 DR, General Kinusake no Yori, aided by the wu jen Omo, attacked Aga. In a terrible battle against Aga's monstrous minions, they prevailed. However, Yori was killed by some goblins and Aga's corpse was never found. Rumors said that he would return one day.