强奸4之最后的羔羊

　　Allen Meneric is committed to a psychiatric institution for the criminally insane because of a brutal revenge murder. There he is forced to deal with the very ill and the dangerous until, as part of a socialization program, he is transferred to minimum security where he meets Mia, a beautiful bipolar female inmate. Ever haunted by his past, Allen seeks his redemption when sudden events demand that he protect Mia from the violence and chaos of the institution.

　　担任临时教师的君岛穗香(涩谷凪咲)，目击了一个女学生从屋顶跳下的瞬间。当她在暑假补习班上课时，又注意到有个不应该存在的学生。不久后，穗香与补习班的三浦瞳(早濑憩)、前川武(山时聪真)等学生们，得知了与那个女学生有关的令人震惊的事实。

　　横跨30年的10宗灭门惨案，所有遇害家庭都有一个共通点：有一位14号生日的小女生。