If a black cat is bad luck, then what is a white cat? After an akumatized Adrien returns to being regular Chat Noir, he thought his life was going to turn to the better. But the ghost of Chat Blanc is still haunting his footsteps and not even his new girlfriend can keep him from questioning dream from reality.

Time has past since the time of The Great Thaw and Arendelle has become prosperous under the rule of the Snow Queen. But little do they know that the King of the Southern Isles has set his eyes on Arendelle. Whether the royal family of Arendelle lives or dies depends on themselves and even more so on the one that they have forgotten.