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.
所有人都避开了她，只有一个人例外，他就是开朗英俊的同学风早晓（三浦春马饰演）。在冯枣的启发下，同学们逐渐接受了内向的爽子，她也和阿音、千禾交到了好朋友。年轻男女之间充满了暧昧和不和，更不用说爽子这个不谙世故的女孩了。尽管向太和我对彼此印象很好，但她仍然不知道如何回应他们的热情。复杂的情绪像杂草一样在心里蔓延。。。这部电影改编自朝日和美的原创漫画。
