|This article is about a/an ally in Hikonin Sentai Akibaranger Season Tsuu.|
Yasuko Yokoyama (横山 靖子 Yokoyama Yasuko) is Yumeria's mother-in-law who is secretly an anime otaku whose favorite series was the Ninja Cap-tan (忍者キャプたん Ninja Kyapu-tan) and went by the name Etsuko Horimi (堀美 江都子 Horimi Etsuko) as a anime singer. Though she forbid Yumeria's otaku quirks on the impression that it would tarnish the Yokohama name, Yasuko accepts it after seeing it first hand.
Behind the scenes
Tatzko is portrayed by Mitsuko Horie (堀江 美都子 Horie Mitsuko).