Pluto. Urasawa x Tezuka. Volume 8: Naoki Urasawa

Who Killed Astro Boy?
In an ideal world where man and robots coexist, someone or something is after the seven great robots of the world. Interpol assigns robot detective Gesicht to this most strange and complex case--and he eventually discovers that he is one of the targets!
Final Volume!
Atom is back, and the fate of the earth is in his hands! Now that Atom has all the answers to the unsolved mysteries around Pluto, Bora and more, he`s prepared to put everything on the line. With the memory of his fallen brethren--Gesicht, Mont Blanc, North No. 2, Brando, Hercules and Epsilon--etched deeply into his heart, Atom is headed for one last battle to save the world!