Title: ‚ÄúDuty Friend‚ÄĚ | Artist: NIKIIE | Show: The Woman Called Fujiko Mine

This smoky song comes courtesy of the last show I finished, the excellent Lupin III: The Woman Called Fujiko Mine. The ED (which is a bit NSFW) is an interesting contrast to the OP, portraying Fujiko as more fragile and vulnerable.