Episode 11 of Hetalia The Beautiful World.
In that episode, it's April Fool's Day. Strange costumes were delivered to everyone together, and it was said that "if you don't come to the plaza in this dress, the most humiliating pictures will be scattered."
So Wakfa reluctantly put on the dress.
Plot:
Black Talia The Beautiful World is a new 2013 story by Hidekazu Hinomaruya preceded by a new story of Black Talia*** There are 100 episodes and 3 specials, and 20 episodes and 4 specials for the new one.
The drawing style is more detailed compared to its predecessor, and there are no more stories from series such as Doujin Talia and Meow Talia.
It started in January 2013 and was finished on June 22, 2013. The theme song is "まわる地球ロンド～"(Rotary Earth Round Dance).