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.
Emu Hino, a 29-year-old virgin, witnesses a mob hit and fears that the killer will now find her and kill her. Indeed, he sets out to do so; he's Yo Hinomura, a talented potter and artist who's been conscripted against his will to be the prime hitman for the 108 Dragons, a gang within the Chinese Mafia, who are determined to push aside Tokyo's local crime lords. He breaks into her house, and she asks that he make love to her before he kills her; she connects to his inner self, and he becomes her protector. Now he must defend her against the local crime gang, who have connections with corrupt Tokyo police. Will Yo and Emu make it out alive, and will the 108 Dragons triumph