Alone On the Ship

Thirty passengers got on to the cruise ship to go from Japan to Norway. Nine of them were tasked as assassins, each with one target. They all know who the other assassins are, but not the other targets. They aren't allowed to tell each other their targets as well. There can be only one assassination per day, though the number of murders isn't limited. Everybody else is either a target or a bystander, with targets not knowing if they are targets. None of the bystanders know who the assassins are. Nobody can leave the boat, or else they die. If all of the targets are killed after the ten days, then the assassins get to walk free with those of their choosing as everyone else is killed. If the assassins fail to kill all of their targets, they are killed while everyone else gets to walk free. One person is a doctor, whose task is to make sure as few murders as possible occur. They can heal anybody who is wounded, including assassins. There is one person who orchestrated all of the events. If the orchestrator is killed, then the events stop, and everyone gets to walk free. The goal of the bystanders is to find out and kill the orchestrator while having one day without any murders. The assassins' goal is to murder their target. The targets' goal is to survive. The breaking of any rules gets the offender killed.

All in all, the goal is to survive- and no matter what, not everyone will make it out alive.

Will contain: Graphic depictions of violence including blood and possibly gore, strong language, possible sexual themes (unsure as of yet), other mature themes.

Based off of Drop Dead Cynical by Amaranthe, Akuma no Riddle (Never watched it, but I'm interested in it..), The Ship.
Reminded me of: 999 (Zero Escape Series), Saw, Danganronpa (A bit..), Corpse Party, etc.