Sacchan and Kotoha notice Yui walking with a couple of her friends from school. The two decide to sneak and follow after them. Sacchan notices Yui doesn’t act quite the same with these friends as she does with Sacchan and Kotoha.

さっちゃん：

「潜入(せんにゅう)作戦(さくせん)とかで別人(べつじん)になりきることがあるかもしれないから」

“Maybe it’s because in an undercover operation or something that she sometimes pretends to be a different person….”

「学校(がっこう)の時(とき)の結衣(ゆい)は結衣(ゆい)らしさを消(け)してすごしてるのかもしれない」

“…that Yui at school might be trying to hide her true self.”