Blue Heaven (manga)

Blue Heaven (ブルー ヘヴン) is a Japanese manga series written and illustrated by Tsutomu Takahashi.

Plot
Blue Heaven is the most luxurious boat in the world. After having taken on two Chinese passengers, there are a series of deaths and disappearances on the boat. Li Chen Long, one of the two passengers is in fact a man who has been missioned to kill without notice. However, he has crossed the path of the rich German Junau family.