Story ant Art: Akira Toriyama
It's been around seven years since JACO was published (the timeframe of its release included the build-up to, and release of, BATTLE OF GODS in Japanese theaters), so I don't recall if it was touted up front as a DRAGON BALL prequel -- but it becomes evident almost immediately in chapter one that that's exactly what it is. But at the same time, it's its own thing and pretty funny too, in its own right.
The story begins with our hero, a goofy space cop named Jaco, crash-landing on a small nearly-deserted island on Earth. The island's only inhabitant is an old man named Omori, who lives as a hermit following the death of his wife years earlier. Jaco reveals that he came to Earth to intercept a being currently en route from a planet of savage warriors. This, combined with glimpses of domelike architecture common in DRAGON BALL, are our first clues that the manga is set in the DB universe, and likely a prequel.
If only to get rid of Jaco, Omari -- a one-time research scientist who was originally on the island to work on a time machine -- begins repairing the patrolman's spaceship. Government operatives soon appear, ordering Omori to leave the island, and soon after, Omori realizes that he needs a rare and valuable element called "sky gold" in order to get it running. Realizing he may be stuck with Jaco for a while, Omori takes his guest to the mainland for some grocery shopping. There, Jaco stops some crimes and becomes wanted by the police. The unlikely duo meets a girl named Tights, who helps them escape the cops and returns to the island with them.
