It was published in Morning 40/1990 issue, and was recorded in "Boushi Otoko wa Nemurenai" (Kodansha). It was later reprinted in "50,000 Bushi" (Enterbrain). [Wikipedia]

Contents of Enterbrain ed. (the chapters has more subtitles):

1. 50,000 Bushi
2. Nippon Soul
3. Happy Lucky Tricky & Empty
4. You Don't Know What Gag is
5. The Good Old Days