"Ladies of the Willow World" is now streaming on Hulu ahead of its premiere on FX tonight at 10 p.m. It’s rooted in an opening flashback to a young Mariko being introduced to Ruri, the daughter of the lord that Mariko’s father, Akechi (Yutaka Takeuchi), now serves. But when Toranaga is married off to Buntaro to form an alliance with the Toda clan, the two young women are separated.