Fight for your Death.
When regular high schooler Grady Hake is mistakenly taken by the Angel of Death, he thinks his life is over. Then he wakes up on a prison shuttle bound for Van Diemann's Planet, a penal colony run by brutal gangs of criminal cultivators. This is his life now, and if he wants to survive it, he'll have to learn to harness his unique Death Spirit, make friends with alien outcasts, appease a band of hungry ghosts, and fight his way into one of the strongest gangs on the planet.
Death Cultivator is a sci-fi wuxia for fans of shonen manga and anime such as Hunter x Hunter, One Piece, and Deadman Wonderland.