Steel Key

"Opens Steel Doors" -Museum Description

General Information
Buy price- None

Sell price- None

Place acquired- Volcano

Drop Monster- None

This Key is the first Key you'll obtain in Denpa Men 3, The other keys you'll obtain later on are the Golden Key and Almighty key 's respectively.

How to Obtain
The way you'll obtain it is if you defeat the Boss, Phoenix within the Volcano.