Koroshi no rakuin (1967)

The number-three-ranked hit-man, with a fetish for sniffing boiling rice, fumbles his latest job, which puts him into conflict with a mysterious woman whose death wish inspires her to surround herself with dead butterflies and dead birds. Worse danger comes from his own treacherous wife and finally with the number-one-ranked hit-man, known only as a phantom to those who fear his unseen presence.