Master Keaton Vol 7

From the VIZ Media edition

When the wall that separated the East and West falls, the 20th century comes to an end and brings radical change to the world. During this turbulent time, Taichi Hiraga Keaton has difficulty finding a job in archaeology even though his long line of cases as an insurance investigator doesn't seem to end. As he navigates through dangerous adventures, Keaton encounters some bittersweet lives...

Source: Anime News Network Encyclopedia