James Ratri

William Minerva (ウィリアム・ミネルバ) is the author of all the books that are currently available in the library of the Grace Field House. He is also the creator of the Promised Pen and the one who built Shelter B06-32 and Minerva's door in Goldy Pond. His current whereabouts are unknown.

History
William Minerva declared a revolution and sealed a "New Promise" to help the children some point in the past.undefined

At a certain point in time, Phil discovered that all the books in the library of the Grace Field House contain some kind of secret message hidden in them. Telling the children to "run from the house, because there is danger lying ahead of them." He left these clues behind in the form of secret coding which the children call Minerva's Morse Code. Minerva also left multiple letters behind. One for the children living inside Grace Field House and one for the Glory Bell orphanages, and one hidden in a book in the library inside a secret shelter, telling the children to head towards Goldy Pond.

William Minerva also left a pen behind for Sister Krone with the initials WM on it, implying that the initials are his. This pen has multiple functions: It can be used as a map to know your current location. It can be used as a simple pen to write with and it can be used as the only key to a secret shelter. It is later discovered that Minerva made multiple pens because the Shelter B06-32 Unnamed Man and Lucas used another pen to enter the secret shelter when they escaped the orphanage they were living in.

Someday in the past, Minerva founded Goldy Pond with the intentions for children to lead a happy, safe life, far away from demons. Deep inside Goldy Pond, hidden inside a windmill lies a secret passage that leads to a door which has the same sign on it as the books in the Grace Field House and the hologram which appears out of the pen. This door is called Minerva's door and serves as a new way to discover new things.

Appearance
William Minerva's profile is never revealed in the manga and it is not even known to the public whenever he is alive or not. But some little things are known about his appearance. He is a tall man, who is almost always seen wearing a suit with a black tie and a hat. On several occasions, he is seen holding a cane.

Personality
William Minerva seems to be on the children's side but at the same time, he seems to be affiliated with the demons and humans outside the Grace Field House. William Minerva appears to be a complex man, leaving hints behind for children to survive the whole thing with the demons.

Sister Krone
It was not known whether Krone has even met William in person before, but the only connection known between the two is Krone in the possession of William Minerva's pen, whom she later left it for the orphans.

Demons
It is implied that he worked for the demons and supplied them with a lot of literature to use in the orphanages. It appears that he worked together with the demons to help the children escape from them.

Trivia

 * In the colored front page of Chapter 18, William Minerva is seen delivering the orphans of Plant 3 Christmas gifts, being dressed as Santa Claus.
 * It is likely that William Minerva's name originates from the Ancient Roman Goddess Minerva. Minerva is the Goddess of poetry, medicine, wisdom, strategic warfare, commerce, weaving, and the crafts. Like William, she is also commonly depicted and symbolised with her Owl, "The Owl of Minerva."
 * William Minerva's name may also be adapted from the 1908 Literature "Miss Minerva and William Green Hill" by Frances Boyd Calhoun.