|Description||A blue key with a pretty, detailed design.|
|Usage||Unlock the door to the Green Area (Blue Area)|
|“||A blue key with a pretty, detailed design.||”|
— Game description
The key is located in the room behind the desk where Ib picks up her Red Rose. When Ib pushes the desk aside, she can enter the room and collect the key. It sits in front of a painting of a smiling blue-haired girl, but when Ib takes the key, the girl will grin evilly. The word "THIEF" will be painted around the wall in scattered red letters.