The story of the movie is somewhat based on the plot of the most recent game, "Sakura Wars 3," released back in March this year. While the game features Lieutenant Ohgami, the main character who takes off for Paris, narrates one side of the story, the movie unveils the secrets behind Hanagumi. Ohgami leaves for Paris, consequently leaving Hanagumi without a leader; thus a new character will be introduced here. To be replaced with Lieutenant Ohgami is the former leader of Hoshigumi, Rachette Artile - a rationalistic and distinct individual, who brings about serious problems to Hanagumi. The members are now in discord with Rachette. Meanwhile, Teikoku Kagekidan was being threatened by some irrelevant demons and a new type of anti-kouma mechas, (brought by an american company) appears and tries to replace the koubu-kai. Having made repeated mistakes due to the absence of Ohgami, Hanagumi is now faced with an unprecedented danger, while the abolishment of Teikoku Kagekidan Hanagumi is being schemed.
突然，一只蝴蝶从神乐的眼睛旁飞过，蝴蝶身上带着闪亮的鳞片和粉末。蝴蝶精神：是的。在晚上，它真的很适合讲故事。在鳞粉的影响下，神乐开始感到昏昏欲睡，她的眼睑开始开合。另一个声音也隐约传入我的耳朵。Tapir:Puff，我再也没有像你那样的翅膀了。等等我。泡芙——蝴蝶精神：快点，快点，神乐大人睡着后——蝴蝶精神——这就是梦中故事的开始！
