Japanese bondage porn is a stranger fetish than on surface level.
Great care is taken in the placement of the ropes and the design of the knots.
If you're into that kind of thing, which I'm not. Anyway, this one is about a bunch of girls that pose for bondage porn and a roper that is also an underground doctor for the Yakuza. The whole business is pretty light-hearted for the subject matter, with the ending playing out like Home Alone. An obsessive young mother of a piano student gets involved with his roommate. He falls in love with a girl his age, and she threatens to ruin both of them.