Yui/History

Episode 16
While preparing for their show at Saga Arena, Yui questioned Shiori's decision to unilaterally invite Ai Mizuno to Iron Frill. She questioned whether Shiori was doing so purely due to her likeness to their former center performer, and admonished Shiori that as good as their old center was, she's in the past. However, Shiori simply brushed this off, saying that she was only considering Ai's skills. Shiori then left to practice with the rest of Iron Frill, with Yui staring at her back as she walked away.

Episode 24
Cameo along with Iron Frill promoting Saga. Yui/Historia