Women forced to have sex on japanese trains?

i heard that in crowded japanese trains, a lot of women get molested/raped by few men, is it true..?
my friend told me this and to prove it he even showed me a video of a japanese women who was forced to have sex with a lot of men on the train.... or maybe it was acting?
Update: derek- we looked it up after the topic rose. we didnt watch the video for the fun of it. i didnt watch the whole thing anyways.
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