Searching for Lupin I’s Treasure

The mountain country of Kima, hidden away in Tibet, has mountains of treasure! On hearing this, Lupin and company head there. Though they infiltrate as a group of anthropological researchers, they are captured by Kinkaku and Ginkaku, the giants who rule the country, and ordered to fight each other as human playing pieces in a game of killer shogi.

Synopsis excerpt via Kitsu.