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.
起初，蔡穗只是把这封信当作恶作剧，但第二天，信中提到的那个叫成濑户（山下慎一郎配音）的男孩居然转到了蔡穗的班上。根据这封信，蔡遂将爱向，向将在17岁的冬天死去。蔡穗应该怎么做才能避免这场悲剧的发生？
讲述日本战国时代末期发生的一场“决定天下”的战役，交战双方为德川家康领下的东军以及石田三成领导组成的西军。最终，在西军将领小早川秀秋叛变的情况下，这场战争在一天内即分出了胜负，德川家康取得了统治权，三年后成立德川幕府。
