Card Lores:Steam Worker, Kuda

This boy was a trainee mechanic, who had worked hard to become the successor of his giant mentor in his original world. His mentor died in a war abruptly broke out, and as he wandered, he was invited by a member of "Gear Chronicle" to join them. To become a "great man" like his mentor, he carries the huge spanner left by his mentor and works hard in maintenance.