The adventure begins in mid-November as another typhoon bears down on Shin-Edo. While it won't make landfall for several hours, the rain is already coming down in sheets. Seemingly, as if from nowhere, dockworkers see the Tanoshī Kōkai sitting in the bay. No one remembers anything about the name, so they simply start their procedures. However, all attempts at contact fail. So they contact [the company that owns the ship].May 4, 2046 – During the Kuro Incident, several hundred ships in the area of the second missile’s “disappearance” themselves disappeared. Among them the Tanoshī Kōkai (楽しい航海,or Joyous Voyage) a heavy freighter bound for Shin-Edo.
It was a not so secret, secret that the crew were all affiliated with [some Yakuza gang] and were known to smuggle Koreans into Shin-Edo as cheap labor (as well as other, more lascivious, jobs). They did so by bribing local officials and by hiding Koreans in one of the ballast tanks.
On April 26, after having been locked in the ballast tank for over a month with nothing but themselves and their own filth, and with barely enough food and water to survive, the refugees did something desperate. One of their own, a young man named Yeung-Su Moon (who'd had some training in acrobatics before he learned cybernetic and biotech replacements made his, wholly natural, skills moot) crawled out through the intake pipes with the idea of breaking them out from outside the tank.
Unfortunately, electronic locks spelled the doom of both the rescue attempt, and the lives of the refugees. Having dealt with this before, the crew simply waited for Yeung-Su to get out of the pipes (not wanting his body to block the water flow) then flooded the entire tank, killing everyone inside.
Then they did away with the young man and tossed his body overboard. But not before taking out their anger (at the lost revenue) upon his poor, helpless, body.
No sooner did his body hit the water than the crew looked up to see a missile streaking toward Shin-Edo.
An hour later, a data recovery team from [the company] take a launch out to the boat. All seems fine (though they aren't in contact with the dockworkers) right up until one member of the recovery team takes a screaming swan dive off the main deck to the water below.
At that point, both the company and the observing dockworkers call the Police. PCs are all members of the Shin-Edo Metropolitan Police Department (doing various jobs, detectives in both the homicide and computer services/financial crime divisions, two SAT (SWAT) members (one is a hand-to-hand specialist, the other a demolitions person), a criminal psychologist and a medic, possibly a forensic pathologist).
All they will be told is that there has been a death down by the docks and that hostages may be involved. They are to deal with the matter quickly and quietly.
As for Scenes, I have the following:
1.Getting the Call - where PCs get the bare bones of the adventure and I set the scene (with torrential rains, cold, the coming typhoon, the dark, etc.)
2. Scene of the Crime - SAT goes in first to secure the team (the two PC members are left behind for various reasons). That leaves the PCs free to speak with all the witnesses, learn what else is going on (including the ship's history, albeit without the whole smuggling aspect) and the fact that one of the men who took the data recovery team over to the ship swears that the man who died was pushed off rather than jumped off.
3. All Aboard! - SAT commander declares the scene safe and says PCs can come over. Once there the PCs discover something wrong. While they can speak with the commander, they only see any of the SAT members from a distance.
And at that point I'm kind of lost, so let me tell you what's really going on.
I'm hoping its obvious that Yeung-Su Moon is the culprit. He became a Yurei because of the tortures he suffered and the loss of his friends/family when they were killed in the ballast tank. The rule he follows is that he can/will only kill Japanese who board the ship. And he goes about it by taking control of all electronics on board. So it's he that's talking to the PCs in Scene 3, rather than the SAT Commander. He also controls all the robots on board, and uses them to kill. That means most of the adventure makes it appear that the AI in the ship has gone rogue and is sending bots to get them (and locking the doors to keep them inside, etc.)
I'm picturing a hunt for the missing SAT members, the discovery of the bloated Korean bodies in the ballast tank and perhaps finding where the crew tortured Yeung-Su. In addition, there should be some investigation about what exactly the ship was doing and the crew's allegiance/side business. To tie things up, PCs will need to discover it's not a rogue AI but rather a Yurei (though I don't know it's necessary for them to learn it). Followed up by coming up with a solution to the problem (not letting any Japanese on board ever again would work, and would allow the company to get their cargo. Alternately, skuttling the ship would also do the job, though they'd have to get it out in deep enough waters to make sure it sunk completely. Finally powering the whole thing down would reveal the Yurei, but none of the PCs has any ghost killing equipment.)