Brain Thunder

Brain Thunder (ブレインサンダー) is Kī Saegusa's favorite Aikatsu Drink. Other than being told to boost brain activity, not a lot is known about this drink.

Background
The background and invention of Brain Thunder is yet to be known. However, it could and has been speculated that this drink might be one of the works of Mizuki Kanzaki and Tiara Yumesaki in order to increase the number(s) of promising idols.

Image Girls
As a product, Brain Thunder has also held various campaigns for promotions. As of Episode 66, Kī has become the drink's image girl.

Others
Despite being mainly perferred for idols, Brain Thunder is shown to be sold in normal restaurants and cafes, like Cafe Vivo.