The Disappearance of Nagato Yuki-chan Season 1 Episode 11
The Disappearance of Nagato Yuki-chan I
As Ryoko suspected, Yuki IS different from who she used to be. While Ryoko and Kyon are worried that Yuki might behave so differently that their classmates may figure it out, she plays the role of the old Yuki just fine and no one notices anything.