Dragon Ball: General Blue Saga by Akira Toriyama
This review covers Chapters 70-83 (Volumes 6 and 7) in the Dragon Ball series.
Goodreads Synopsis
This installment finds Goku, Kuririn, and Bulma exploring a pirates' cave, where they encounter a cutlass-swinging robot and a giant octopus. Still more threatening is Commander Blue, who is following them to steal the pirates' Dragon Ball.