City Hunter: Hyakuman Doru no Inbou

A wealthy American woman named Emily O'Hara hires Ryo Saeba and Kaori Makimura to guard her from a man named Douglas, offering a million-dollar reward. Ryo and Kaori accept the assignment, but the situation proves complicated. It becomes apparent that Ryo himself may be the intended target, though the identity of those seeking his death remains uncertain.