Picture drama. Second part of the last episode of Ryo-Ohki 2.

DVD specials.

A dying mob boss entrusts Lupin with a diamond that supposedly is the key to a vast treasure. But when Lupin is attacked by an assassin and saves a mysterious girl from trouble, it becomes clear that that there’s more to this treasure then meets the eye… (Source: ANN)

Episode 26 included in the ninth DVD volume of Kaibutsu Oujo.