Dragon Circus 0

The sudden appearance of massive monsters known as "Dragons" throws the world into chaos. The New United Nations, created as a response to the threat, puts together a team known as the Dragonslayers, including (among others) a vampire, an android, a witch, the animated remains of the legendary ogre Shuten Doji, and....a little girl?! Ace pilot Momo may still be in grade school, but she just might have the skills to save humankind. Taut action, propulsive storytelling, and sly humor take this seinen action series to new heights and unexpected places! A dragon—the first of many—appears in the skies over Tokyo, and in an instant the world is changed forever...not least of all for Dr. Abe, who loses the woman he loves to the beast's fearsome onslaught. Decades later, a mysterious figure joins the desperate fight, coming to humanity's aid on a battlefield in the United States: model DS-08, code name Shikigami. He wears Abe's face, and his rallying cry is "Death to all dragons—!"

Volume 0 of the DRAGON CIRCUS manga series by Eiichi Shimizu.