On the off chance that you haven't seen any previous Lupin III films/series... this series is centred on 'The World's Greatest Thief', the gentleman thief Arsene Lupin III. Lupin works with colleagues Daisuke Jigen, a master swordsman and crack shot Goemon Ishikawa XIII. He also occasionally works with the beautiful Fujiko Mine, his former lover who is now a rival. Always after them is Inspector Kouichi Zenigata of the ICPO. Over the course of the series Lupin and his associates get caught up in a number of escapades; some lasting several episodes others that last just one.
Before watching this my experience with Lupin III was restricted to 'The Castle of Cagliostro' and one other film. That didn't matter though. The various stories were a lot of fun to watch; providing both excitement and laughs. The animation was of a high quality; thankfully the character designs remain faithful to the classic look without 'modernising' them to make them look more like characters in new series. This doesn't make the series seem dated; in fact two of the main stories revolve around the difficulties of staying anonymous in a social media age if everybody is looking for you. Overall I'd definitely recommend this series whether you've seen Lupin III before or not.
These comments are based on watching the series in Japanese with English subtitles.