Tokichika's descendants remained in Echigo while ruling indirectly over the territory of Aki.

The Mori clan grew in power and became a prominent feudal lord in Aki Province during the Muromachi period.

However, in the Battle of Sekigahara in 1600, Mori Terumoto, the clan's leader, was defeated, and their territory was significantly reduced.

Masanori implemented changes in the military and education systems, but compromises were made in Aki due to the influence of local feudal lords.

Mihara Fortress had been abandoned, but the Fukushima family secretly relocated a turret from the destroyed Tomo Castle.

In 1619, Masanori was found guilty of unauthorized renovations to Hiroshima Castle and his territory was significantly reduced.

In 1591, Terumoto relocated to Hiroshima while it was still under construction, using it as his base to rule his domain covering most of the Chūgoku region.

Following the Battle of Sekigahara in 1600, the Mōri were forced out of Hiroshima by Tokugawa Ieyasu and relocated their base to Hagi Castle, losing most of their eastern territories.

The shogunate then ordered Fukushima to Kawanakajima Domain, and awarded Hiroshima to the Asano clan, who ruled it for the remainder of the Edo period.

Despite being smaller than the Fukushima territory, it gained approval from the shogunate with a detection level of 426,000 koku.

The domain reported a total debt of 3,742,290 ryo to the Meiji government in the same year.