Hitoshi Nagano, who works at an electronics store, picks up a cellphone left behind by a customer and goes about a scam. He calls the person's mother and pretends to be her son. He then gets the mother to transfer money to his bank account. Soon, Hitoshi gets a lot more than he bargained for.
Montage reads the films you've rated and works out how this one lands for you. Free, and about two minutes.
