A Stage Beyond Time - S2.E24

On the night before the Jeweling Festival, Charles comes to find Aine and Mio as he has discovered his sister and Hibiki have gone missing, as have Mirai and Karen. Aine and Mio tell him not to worry as the four idols have gone off to spend time with each other, and help each other overcome their biggest weaknesses in order to be on top form for the Jeweling Festival.