Deus Ex Machina by Karasuma Wataru — Ongoing

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Clockworkers- mechanical men, created during the war as a weapon to kill as many as possible. That war may be long over, but rogue Clockworkers are still roaming about, spreading fear and death wherever they go.

Machina's a member of the CWA, an organization dedicated to the destruction of these rogue robots. Along with Deus, her Clockworker partner, she travels the country in hopes of eradicating them from the world... - Horobi no Michi

Volume 1
Chapter 1 released Dec 14 '08
Chapter 2 released Dec 15 '08
Chapter 3 released Dec 16 '08
Chapter 4 released Jan 11 '09
Chapter 5 released Jan 23 '09
Chapter 6 released Feb 21 '09
Chapter 7 released May 27 '09
Chapter 8 released Jun 29 '09
Volume 2
Chapter 9 released Jul 19 '09
Chapter 10 released Sep 4 '09
Chapter 11 released Oct 23 '09
Chapter 12 released Oct 12 '10
Chapter 13 released Oct 14 '10
Chapter 14 released Oct 31 '10
Chapter 15 released Nov 13 '10
Volume 3
Chapter 16: The Boy's Decision released Oct 10 '11
Chapter 17: Sundance Hill Corpse Sale released Dec 25 '11
Chapter 18: Radican Boy released Apr 25 '12
Chapter 19: The Worth of a Doll released Jul 21 '12
Chapter 20: Deus's Oath released Aug 16 '12
Chapter 21: The Harbinger is Roused released Dec 27 '12
Chapter 21.5 released Dec 28 '12
Volume 4
Chapter 22: A Person and a Machine released Jul 27 '13
Chapter 23: Hence, Mechanical Doll released Nov 26 '13
Chapter 24: The Promise That Day released Apr 6 '14
Chapter 25: Enforcement's Beacon Signa; released Sep 15 '14