The King of Debris

Citro's an all-too-human android boy who lives with his "grandfather," an old mechanic, and Corona, the mechanic's granddaughter. When warring factions battle it out at his home, a powerful device implants itself in Citro, making him both more powerful and the target of evil forces. Tragedy propels Citro and Corona on a quest, accompanied by their new ally Tera, the broomstick-flying, techno-witch. (Source: ANN)

Gareki no Ou had two volumes published in English as The King of Debris by CMX Manga from March 19, 2009 to September 22, 2009.