|Find Target||One-Leaf Door|
|Location||First Class Guest Sector|
|Chapter||The Unlucky Clover Field|
|Purpose||Opening One-Leaf Clover door|
|“||A key shaped like a one-leaf clover.||”|
The One-Leaf Key is a key item found after attempting to donate the Green Butterfly in the Gift Box. Jennifer finds it immediately on the floor afterwards. It is eventually combined with the Copper Leaf to form the Two-Leaf Key.