Rusty Key

The Rusty Key (さびたカギ Sabita Kagi) is an item received in the Bushlands.
== Appearance ==
The Rusty Key has patches of brown and is darker at the tab. The tab is triangular with a triangle shaped pointed inwards towards the right.
== Collection ==
The Rusty Key is received from Kazuma Sakamoto in the Bushlands who gives it to Quote after talking to him through a crack in Shelter wall. Kazuma asks Quote to unlock the door with it, and the player must examine the door in order for Quote to realize that the door has no key hole and is supposedly rusted shut. 
== Function ==
The Rusty Key is used to unlock the door to the Power Supply Room. Aside from that, it remains in the player's inventory and has no further purpose.