Watch Gantz: O (2016) full movie online English sub.
Synopsis: 17-year-old Masaru Kato’s life ended when he tried to save an old man from a knife-wielding maniac, only to wind up stabbed himself – or so he thought. Instead he wakes up in a room with a handful of strangely-dressed people and a large black ball the others call Gantz. They explain to him that he’s been trapped in a survival game: players are teleported to sites where they use black body suits and fantastic weaponry to end the rampages of bizarre alien monsters that have been attacking both Osaka and Tokyo.
Directors: Yasushi Kawamura, Keiichi Saitô
Writers: Hiroya Oku, Tsutomu Kuroiwa
Stars: Chris Jai Alex, Saori Hayami, Mao Ichimichi
More infor: IMDB, Wikipedia