Master Keaton OVA (1999)

Taichi Keaton is a man of many talents: father, historian, frequent traveler, negotiator, archaeologist, former survival instructor, and all while working as an insurance investigator for Lloyd's of London. While his methods may seem a bit unorthodox, he gets the job done when needed, but not without a little something to learn or teach in the process. Through all of his adventures, some people call him a quack. Those who know him well call him a master of life... (Source: ANN)