The narrative of the film draws inspiration from the storyline of the latest game, "Sakura Wars 3," which was launched in March this year. The game follows Lieutenant Ohgami, the protagonist who journeys to Paris and tells one part of the story, while the movie reveals the mysteries surrounding Hanagumi. With Ohgami's departure to Paris, Hanagumi finds itself leaderless, paving the way for a new character introduction. Stepping into Lieutenant Ohgami's shoes is Rachette Artile, the former leader of Hoshigumi, known for her logical and unique personality, which causes considerable issues within Hanagumi. The members start experiencing conflicts with Rachette. At the same time, Teikoku Kagekidan faces threats from unrelated demons, and a new model of anti-kouma mechas emerges, introduced by an American company, attempting to usurp the koubu-kai. In the absence of Ohgami, Hanagumi's repeated missteps have placed them in severe jeopardy, with a plot unfolding to dismantle Teikoku Kagekidan Hanagumi.