Ken is an adventurer. More precisely, he's a transporter, and he never refuse an order, except if it implies weapons or drugs.

In the summer of 1896, 4,000 workers were deployed to begin construction of a massive railway line between Mombasa and Nairobi, hoping to bring civilization to the African continent. But then, a man-eating lion appeared... This is a dark story based on true events. (from hmv.co.jp)