In the twilight of the Tokugawa shogunate, the 13th shogun Iesada had a fragile constitution. In hopes of ensuring a sturdier heir, he ends up marrying the feisty and hearty daughter of the Shimazu clan, Atsuhime!
During this time, the power 
of the shogunate grew weak,
El poder del shogunato
se redujo mucho en ese periodo
Nesse período, o poder do
xogunato enfraqueceu,