Aikatsu Stars! episode 23

It aired on Thursday, 15 September 2016.

Descent of the Tundra Songstress!

"The Lucky Seven of Four Star Academy" is where if you collect every wish, something will come true! Yume and Laura, start looking for these wishes, but they can't find the seventh "Tundra Songstress" who is nowhere to be found. Meanwhile, Yuzu Nikaidō of S4 is at an event, and announces that her show is going to be replaced by another idol who is about to make a guest appearance.