Assignment (2016)

On a busy night in Shinjuku, Tokyo, a hooker in high school uniform picks up a drunken john. Their tryst is about to commence, but little do they know that in the very room in a shabby love hotel where they settled at, a woman, hidden under the bed, is on assignment conducting a research on sexual behavior. While the john is taking a shower, the hooker tries to steal his wallet. However her theft attempt fails exposing the researcher with the horrific consequences.