The Pig's Retribution (1999)

Virginal 19-year-old Shokichi goes to the small island Maja-jimais, to collect the bones of his father Shoji, a man he never knew, which have been left to bleach in the sun at the foot of the cliff where the sea washed them up. But Shokichi is accompanied by three hookers who take the trip as a vacation - at least, until they all go down with food poisoning, probably from eating bad pig's liver.