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.
该动画改编自北田龙马创作的同名漫画作品，以将夺取人类H能量的神秘入侵者“寄生虫”所威胁的世界为舞台，讲述了一位名叫盐城烈人的高中生作为守护地球英雄团体的一员，与寄生虫作斗争的故事。
Kikai女孩的单纯和真诚让Rick逐渐放下了戒备，向Hubby敞开了心扉，他们的关系也越来越牢固。最终，他们两人带领人类共同面对终极之战，而年轻的女孩Hubby也将面临在爱人和生活之间的残酷选择。一天即将结束，在251秒内，我打赌会有一次激情的忏悔。
