Cash Calls Hell (1966)

Before leaving prison, Oida uncomfortably enters into an agreement with his cell mate: in exchange for a half-share of 30,000,000 yen, he is to assassinate three strangers given to him on a list. However, upon meeting his first potential victim, Oida has second thoughts. Yet, even as he tries to back out, the body count starts climbing. Oida must now try to alert the people on his list of their impending danger, and find out why they are being targeted in the first place.