Monster ran in the biweekly Big Comic Original from 1994 to 2002, to a total of 18 volumes that were published by Shogakukan between June 2005 and February 2002.
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| Herr Doktor Tenma Published June 30, 1995 |
Surprise party Published September 30, 1995 |
Kinderheim 511 Published April 27, 1996 |
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| Ayse's friend Published August 30, 1996 |
After the carnival Published April 2, 1997 |
The secret woods Published May 30, 1997 |
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| Richard Published October 30, 1997 |
My nameless hero Published February 26, 1998 |
A nameless monster Published May 30, 1998 |
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| Picnic Published October 30, 1998 |
The dead angle Published March 30, 1999 |
The Rose Mansion Published June 30, 1999 |
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| Escape Published February 29, 2000 |
That night Published June 30, 2000 |
The door of memory Published October 30, 2000 |
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| Welcome back Published February 28, 2001 |
I'm home Published August 30, 2001 |
Scenery of the doomsday Published February 28, 2002 |
As far as I know, Monster has been/is being also published in France, Germany, Italy, Spain and the United States - though maybe it has been licensed somewhere else, I haven't been able to find information on that matter.