As the World's Greatest Mercenary, Bolt Crank embarks on expeditions across the globe, earning his title on account of his exceptional abilities as well as his knack for consuming anything and reconstructing it in his right hand. Along his travels, he encounters new companions, as well as his adversary, Hard. However, his mysterious previous association with Leon Field becomes relevant when he is drawn into an unsettled mission from his past, triggered by the emergence of Shadow, a man with the ability to manipulate machines and who assumes the identity of Bolt Crank, and Stella, a woman set on mechanizing every human on earth.
