Promised Pen

''This article is about the Manga version of the Promised Pen. For alternate pages referred to by this name, please click any of the icons above.''

The Promised Pens are objects possibly made by William Minerva, which were either left behind at certain places or given to certain people for the orphans in the Premium Farms to have the chance to find a safe place in the form of Shelter B06-32 or Goldy Pond, or originally an escape to the Human World.

Appearance
The pen cap is plain white and body of the pen has a black and white checkered design with the tiny letters W.M. written on the end of it. The body of the pen slides open revealing a hidden compartment with the letters B06-32 written on it. The hidden compartment also projects a virtual map which tells the user what their current location is.

Origin
Not much is known about the pens aside from the fact that there are at least three pens which both serve as a key to the underground shelter. The oldest and first pen was left behind at a different plantation then the Grace Field House, possibly by William Minerva.

Function
The pen has at least 5 known functions:
 * Location: When the hidden compartment of the pen is opened, it projects a virtual navigation map for the orphans to find their way in and out the Grace Field House. It also shows their location outside the orphanage.
 * A key: The pen is the only known key to enter the secret Shelter B06-32 underground. It also is the only known key to enter Minerva's Door in Goldy Pond.
 * Codes: The pen contains multiple unknown codes and messages.
 * Writing: The pen cannot be used to write with.
 * Pen Cap: Found in the Golden Lake, the cap is a 'memory stick' with updated data, and gives information about Demons and the Demon World.

Promised Forest Arc
After the children escape from Grace Field, they discover that the Promised Pen has Morse code on the virtual navigation map which translates to "Touch Me". After touching the map, a box pops up with a virtual keyboard and the numbers "13-18-02". The children then realize they need to type a password into the box and that the one book from Grace Field's library that contained Minerva's owl bookplate but had no Morse code contains the password. By opening the book to page 18 and going to line 18, the second word is "Human" which turns out to be the password. After entering "Human" into the box a message from William Minerva telling the escapees to head to B06-32 is revealed.

When the children arrive at Shelter B06-32, Ray opens the Promised Pen which displays the same virtual navigation map with Morse code that translates to "Touch Me". After touching the map, a box pops up with a virtual keyboard and the numbers "45-03-03". Opening the book to page 45 and going to line 3, the third word is "Hope" which turns out to be the password. After entering "Hope" into the box a new set of numbers: "108-15-01" is revealed. After going to page 108 and going to line 15, the first word is "History". After entering "History" into the box, a welcome message from William Minerva appears and the door to the shelter opens.

The Map
The pen serves as a navigation map for the orphans to find their way in and out the Grace Field House. It gives clues on where to go in certain codes. As per the Promised Pen, the Demon World is theoretically divided into four areas, with Grace Field House as the origin point. Going clockwise, they are labeled A, B, C, and D. The pen also tells the user their current position on the map in the form of coordinates made up of a single letter followed by two numbers, a dash, and two more numbers. The letter indicates the user's current area on the map, while the numbers on the left side of the dash indicates the distance north-south and the numbers on the right indicates the distance east-west. For example, B06-32 means area B, 06 degrees south and 32 degrees east.

0-Area

 * 00-00 is where the Grace Field House is located.

A-Area

 * A08-63 is where Goldy Pond is located as well as the Goldy Pond Resistance. Inside, a windmill is a passage leading to a door that can only be opened with the pen.
 * A04-12 is where Emma, Ray and the other Grace Field Escapees end up after traveling with Mujika and Sonju for three days.

B-Area

 * B00-15 is the place where the children ran off to after they escaped from the underground bloodsucker trees.
 * B01-14 is the location where the children fell into an underground pit.
 * B04-21 is the number shown in the underground tunnel that leads from the Demon Forest to the underground Shelter.
 * B06-32 is the location of the underground Shelter B06-32 in the Demon World.

C-Area

 * Unknown

D-Area

 * D528-143 is where Cuvitidala is located.