According to https://lupin.fandom.com/wiki/Sexy_Lupin_III, the second story was adapted into an episode.
The relation should probably be changed tho.
- Churd5 years ago

Rats, my memory strikes again. I even liked that episode!
Now it's weird, I suppose. The series came first which would imply that show manga is an adaptation (like Evangelion for example), but since this specific episode is based on the manga... but 80% of the manga is original...

