Tsutomu Takahashi - Blue Heaven

The world’s largest luxury ship 'Blue Heaven' saves a wrecked ship out at sea. At the captain’s command, the ship is searched, and 2 male survivors are rescued. On the ship, there are signs of horrible bloodshed. One of the rescued men, of unknown nationality, loses himself among the ship’s passengers and starts randomly slaughtering the patrons and staff.

If you are in the world of manga you mostly likely heard of this guy. He has quite an repertoire of popular works like Jiraishin (which I highly recommend btw.), Sidooh and Skyhigh (Jigoku Shoujo ripped this one completely).

Blue Heaven is one if his lesser known and I don't really why it is because it's also great (but not that great if you compare it to Jiraishin :P). The story might sound a bit like some thrashy horror flick but the story is developed very well and there are many interesting characters and equally interesting stories behind them. The art is actually something similar to Hiroakis, but that's just my way of seeing things. I could be wrong ahah! Anyway, recommended for fans of thrillers and murder stories.

Download.

There's also an unrelated bonus one-shot story called 69 in this as well.