009-1 is one of those anime that I watched on a whim and while it initially failed to capture me due to a lack of proper story structure or a cohesive plotline up until the final three-or-so episodes, what little story there was did grip me as it came to highlight not just the secretive nature of the job Mylene Hoffman does as a spy for the Western Bloc if my memory serves me right? Her encounters with all sorts of characters throughout the series as well as the unraveling of her backstory is what really did drive me into the show. 009-1 is one of those anime where there is little enjoyment to be derived from the story or the worldbuilding itself, but rather on the characters who inhabit it.
Following Agent 009-1 as she showed compassion at the cost of the mission to those who needed it, mingled with multiple love interests and at the same time ruthlessly executed anyone who stood in her way, the departure of a story where a female character has no complexity to it was a great success for me. I enjoyed the many emotions 009-1 has to endure as she makes her journey across both sides of the country, the Western and Eastern Blocs to achieve her goals. There's moments of intense intrigue as well as levity, which makes the story stand out even more. Mylene Hoffman is the main, and practically only, reason to even watch this show in the first place which is both a boon and a bane at the same time.
The unfortunate side of things rears its head when the realization is made that 009-1 really IS the only reason to watch this show for, as every other character is either one-note, insignificant or irrelevant to the episodic nature of the show and outside of 009-1's interaction with others, there isn't a lot of bone to sink one's teeth into when watching this anime. It was still enjoyable to watch but not something I'd recommend if one is looking for a more story-driven show that breaks any unexplored territory. At the very end of it all, it's a run-of-the-mill show about an attractive spy lady doing expected things from a spy, though the occasional unexpected plot twist acts as a nice surprise whenever they do happen.