Bolt Crank is an "explorer"--a mercenary who only accepts jobs that fits his moral standards. Even so, explorers like him are rarely trusted, and employment--both in getting and also doing the job--is hazardous. However, despite the fact Bolt says it's the only job he's any good at, he's also the best explorer around. Moreover, he has a unique ability. He's able to eat anything at all, and later can reproduce it wholly intact and functional! As an enigmatic man of few words, it's hard to understand someone who can do something so strange, whose only skill involves taking dangerous jobs for money, and who despite it all, just wants to be normal. In a mysterious world of advanced technology and weird science, it seems that some things never change. 
 
(Source: Discotek)

Bolt Crank travels the world as the World's Greatest Mercenary. He got that moniker due to his skills, as well as his ability to eat anything, and then reproduce it in his right hand. During his adventures he meets new friends, as well as his rival Hard. But, his mysterious past with a man named Leon Field comes into play later on when Shadow, a man who can control machines and calls himself Bolt Crank, and Stella, a woman who wants to mechanize every human on the planet, has Bolt going back to an old, unfinished mission he left behind long ago. 
source:ANN

The continuing adventures of Bolt Crank, the World's Greatest Mercenary, who has the ability to eat any object, mostly metal and weapons. When the time comes, Bolt can then reproduce those weapons and items in his right hand.
 
(Source: Anime News Network)

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