First, we go to Hello Work and train Ichiban as a Foreman. We get the skill of destruction, which allows you to open new paths in the dungeons and open the veil of golden keys secrets.


The hidden black market vendors are marked on the map above. The first two offer a gold key for 10,000 yen. The third one sells various items and accessories.

The first vendor can be found at the end of Sunrise Street.


The second vendor is located in an alley of Chinatown.


The third vendor is to be found in the Bar District.


Good luck!