故事紧接着上一部展开。拉拉(陈东兰 Lana Condor 饰)和皮特(诺亚·森迪尼奥 Noah Centineo 饰)总算是互相坦白了感情走到了一起,他们两人都兴致勃勃的准备迎接在一起之后的第一个情人节的到来。对于这对初来乍到的小情侣来说,之后两人所要经历的一切对他们既是享受也是挑战,从来没有过类似经验的拉拉内心里难免充满了忐忑。 基蒂(安娜·卡思卡特 Anna Cathcart 饰)、玛格特(贾娜尔·帕里希 Janel Parrish 饰)和新结识的伙伴斯托米(霍兰德·泰勒 Holland Taylor 饰)是拉拉最坚实的后盾,但拉拉有时候又会觉得疑惑,自己是不是过于依赖她们了呢?当约翰(乔丹·费舍 Jordan Fisher 饰)再度出现在拉拉的身边时,给她和皮特的感情带来了许多不确定因素。
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.