Dantalian no Shoka Wiki
Book of Division
Phantom Books
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Original Name


Romanized Name





Fragment 1 (light novel 6)


It divides the reader into two.


The Working Man



The real title of this Phantom Book Egg was never revealed in the series. It was used by a man who wished to have a second body. It’s present in The Working Man fragment.

It’s a book containing a prescription for a medicine.[1]


The Professor kept the Phantom Book Egg inside a drawer of a desk in the consultation room of a suspicious hospital with no nurses or patients.[1]


It contains the prescription of an undiscovered medicine. The person who drinks the medicine as described in the Phantom Book Egg is divided into two identical individuals. The numbers grow as the Phantom Book Egg is used repeatedly. It works like a cell dividing itself. The copies have the same appearance and personality of the original person. It takes some hours for the division to occur. A negative side to such power is that the clones reproduce asexually, so they have no genetic diversity, which can make all of them vulnerable to diseases and climatic changes.[1]


The hard worker man needs some of rest, but he doesn’t have relatives to work for him, nor enough money to hire someone. The only way for him to improve his health while maintaining his shop open is to have a second body. The Professor removes a Phantom Book Egg from the drawer of his consultory. It contains a prescription for an unknown medicine. He tells the patient to follow the recommendations and dosages.

Three days later, the man returns to the suspicious hospital. He explains that he drank the medicine, following the instructions in the Phantom Book Egg. The next morning, a clone of himself appeared. The Professor explains that the patient had successfully become two, like a cell dividing itself. As requested, now the hard worker has a second body.

The shopkeeper notices the advantages of having a clone of himself. He uses the Phantom Book Egg again. The man fills his shop with workers identical to himself. Soon, the shops spread through the country. The buyers are always attended by the same middle-aged man.[1]


  • As explained by the Professor, cell division is equivalent to asexual reproduction for unicellular organisms. However, this kind of reproduction is also observed in multicellular organisms such as sea anemones and planaria.[1][2][3][4]
  • The Professor reveals that the patient expressed the ability of transdifferentiation. It's a process in which one mature, specialized cell transforms into another cell type without undergoing an intermediate pluripotent state, when it has potential to differentiate itself.[1][5]
    • The Professor talks about the immortal jellyfish to exemplify transdifferentiation. The Turritopsis nutricula is a small animal that once reaching adulthood, can transfer its cells back to childhood and multiply itself. The species is thought to have an indefinite lifespan.[1][6]
  • The Professor discusses about genetic diversity with Rasiel. While asexual reproduction may have short term benefits when rapid population growth is important or in stable environments, sexual reproduction offers an advantage by allowing more rapid generation of genetic diversity, allowing adaptation to changing environments.[1][7]


  1. 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 The Mystic Archives of Dantalian light novel, Fragment 1, volume 6.
  2. Cell division. (2020, May 14). In Wikipedia, The Free Encyclopedia. Retrieved 19:26, May 24, 2020, from https://en.wikipedia.org/w/index.php?title=Cell_division&oldid=956664110
  3. Sea anemone. (2020, April 21). In Wikipedia, The Free Encyclopedia. Retrieved 19:26, May 24, 2020, from https://en.wikipedia.org/w/index.php?title=Sea_anemone&oldid=952266493
  4. Planarian. (2020, May 23). In Wikipedia, The Free Encyclopedia. Retrieved 19:27, May 24, 2020, from https://en.wikipedia.org/w/index.php?title=Planarian&oldid=958419981
  5. Transdifferentiation. (2020, April 15). In Wikipedia, The Free Encyclopedia. Retrieved 19:25, May 24, 2020, from https://en.wikipedia.org/w/index.php?title=Transdifferentiation&oldid=951164165
  6. Turritopsis nutricula. (2020, April 16). In Wikipedia, The Free Encyclopedia. Retrieved 19:28, May 24, 2020, from https://en.wikipedia.org/w/index.php?title=Turritopsis_nutricula&oldid=951249723
  7. Asexual reproduction. (2020, May 9). In Wikipedia, The Free Encyclopedia. Retrieved 19:33, May 24, 2020, from https://en.wikipedia.org/w/index.php?title=Asexual_reproduction&oldid=955716153
Phantom Books
72 Sacred Notes of the Shem-ha-mephorash - Atargatis Scripture - Book of a Thousand Sorrows - Book of Adventure - Book of Atonement - Book of Avalon - Book of Equivalence - Book of Fairy - Book of Fetus - Book of Gap - Book of Humanization - Book of Hypnosis - Book of Lifetime - Book of Relationship - Book of Styx - Book of the Eleusis Ritual - Book of the House-Elf - Book of Imprint - Book of Meditation of Supreme Cooking - Book of Oblivion - Book of the Outer God - Book of Paradise - Book of Royal Power - Book of the Sage - Book of the Salamander's Seal - Book of Sleep - Book of the Descendant of the Mist - Book of the Feast of the Dead of the Windowless Hall - Book of the Flatterer - Book of the Jealous Girlfriend - Book of the King's Coffin - Book of the Ritual of the Migratory Locusts - Book of the Silver Well - Book of Those Who Want Beauty - Book of Twilight - Book of Wisdom - Catalogue - Collection of Visions - Crastinus Dies Nunquam Sciat - Decorative Plywood of Merneith - Depiction of Mountains and Rivers - Divine Encyclopedia of the Yin Kings - Divine Pattern of Floating Silk - Faceless Book - Fata Morgana - Go in an Instant - Hezār Afsān - Hymn of Hel - Logbook - John Wilkes Booth’s Diary - Kairos’ Dynastic History - Loge - Memories of That Day - Old Bradshaw’s Timetable - Pioneer Book - Phantom Book of Resurrection - Phantom Score - Rahōto Reihō Kaigen - Ritual of Reality - Template Book - The Aggregate of Burning Golden Beads - The Clay Tablet of Ugarit - The Dictator's Book - The Great Queen Poem - The Harlequinade - The Nāgārjuna’s Manuscript - The Ophiuchus Manuscript - The Pedigree of All Creations - The Sage's Slate - The Scent God's Scripture - The World - Vignette of Eternal Twilight

Phantom Book Eggs - List of Phantom Books
Phantom Book Eggs
Book of Connection - Book of Division - Book of Imitation - Book of Warmth
Book Which Fools Cannot See - Ilas' Collections of Poems