Master Keaton 4 features story by Hokusei Katsushika & Takashi Nagasaki and art by Naoki Urasawa.

Taichi Hiraga Keaton's dream is to devote his time to further studying archaeology. In reality, however, he is an ace investigator for the insurance organization Lloyd's. A kindhearted man, Keaton has a life filler with danger and setbacks due to his job and calling.