Having completed their mission to save the world, Ink and Sumi return home but they can no longer transform or use magic. Ink becomes depressed because she can't help Nao-kun study English anymore. When Sumi realizes this she devices a plan to help Ink -- by recreating their uniform so that they can cosplay as magical girls.
A dangerous enemy named Black Darkness has been unleashed, threatening to destroy the world. Ink, Sumi and their sidekicks travel to the magic kingdom to battle her.
Ink catches a cold and has to leave school early. Her friends visit her at home. While taking care of her Sumi remembers their friendship from their childhood.