《失踪少女55》是Koshizaka执导，奥嵨广太、宇佐野瞳、前田优希主演的惊悚片。 影片讲述小岛京子找到人生第一次正确且有意义的工作——查寻组织秘密的故事。小岛京子，父母早亡，以后就卷入黑暗社会，被ONESti侦查团队所救，她在那里工作，接受间谍工作，然后装扮成女子学生，潜入学校组织，那是绑架少女的问题组织，然后进行严厉非人道的培训，再加以人身灵肉贩卖的学校，小岛京子在那里查寻组织的秘密。这种危险工作，对京子而言，是其人生第一次正确且有意义的工作。

There is a "school" that abducts and confines girls to re-educate them as sex slaves. Kyoko, a bad schoolgirl, was caught by a witch and turned into student number 55. Life in the school is hell where repeated torture, ill-treatment, and rape is called "re-education". However, Kyoko has a hidden purpose. She was trained by a secret organization called Onesti and infiltrated the school as a spy. Her mission is to retrieve top secret data from the trafficking organization and release the captive girls. Kyoko works with classmates Yuka, Yuma, and Yui to formulate a detailed escape plan. Finally, the day of their jailbreak has come...