来自雪国的年轻女孩江户良香（松冈莫约饰演）独自一人在东京工作，从未有过恋爱关系。她每天都喜欢灭绝动物，她永远不会忘记爱情，那就是她学生时代的英俊男孩Ayi（北村和树饰演）。
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.
小林纯（Tomikaga Masahiro饰演）是一位宠物美容师，曾有过一段非常失败的恋情。就在她准备和男友步入婚礼大厅的关键时刻，她震惊地发现，男友不仅结婚了，还生了孩子。这段感情对小林的心造成了极大的伤害，她也相应地关闭了自己的心。
