From the middle aged Far East our Ninja ended up in modern New York, to defeat his arch enemy Kunitoki again, who had taken flight to this place with the help of a leap in time and had built up a new reign of terror. On the way to the showdown you steer Armakuni through the New York of today, which leads you amongst others through parks, streets, drug laboratories and further well-made scenarios.
(source : https://www.c64-wiki.com/wiki/Last_Ninja_2)

Walkthrus and maps:
https://gamefaqs.gamespot.com/c64/580778-last-ninja-2/faqs