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.
由清水富美加和饭丰万理江担任双主演，由《百濑，朝向这边》、《战神：只是爱着你》的导演耶云哉治执导。 影片《暗黑女子》是一部由耶云哉治执导的影片，该片于2017年4月1日本上映。 本片围绕基督教名媛学校圣母玛利亚女子高等学院的理事长之女、全校同学羡慕的物件——白石逸美（饭丰饰演）神秘死亡的故事展开。 好友澄川小百合（清水饰演）代替逸美，继任了文学小组的会长而被成员们怀疑。她为了查明逸美死亡的原因并找出真凶，让成员们写关于「逸美之死」的小说，然后大家一起摸黑开朗读会。 清水富美加饰演文学部部长澄川小百合，白石逸美则由饭丰万理江出演。千叶雄大饰演的北条老师曾是学校文学部的顾问，因向身边工作人员讲猥琐话题被赶走，实际上拥有不为人知的秘密。 其他角色方面，保加利亚留学生狄安娜•迪切瓦由玉城蒂娜扮演，清野菜名出演作家高冈志夜；梦想成为甜点师的小南彩音由小岛梨里杏扮演，总是为奖学金而焦虑的二谷美礼由平佑奈扮演。
