Nudo no yoru (1993)

Jiro is a Tokyo man who offers a stand-in service where he'll do "anything". A woman claiming to be from Fukuoka wants to be shown around Tokyo and see the sights. What Jiro doesn't know is that this woman isn't who she says she is. She's on the run from her Yakuza boyfriend, and Jiro is going to be unwittingly entwined in the situation.