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.
该动画由39节组成，分为两部分：第一部分从2015年7月3日开始，每周五21:30在TOKYO MX首播，共26节。第二部于2016年4月1日首播，共13集。
人类用高科技的结晶——“超级机器人”，经过长达十年的“月世界战争”，成功把可怕的侵略者消灭了，但是…… 早乙女博士以未开发成功的『三一万能侠』迎击反被击溃!一方面博士着手开发『新·三一万能侠』；另一方面，认为必须找到3位合适的驾驶员....
