Killing City: O

High school student Kato Katsu (Ono Daisuke) Dubbing) and his younger brother lived a life of dependence. One day, the subway station where Kato Masaru was located was attacked by indiscriminate murderers. In order to save people, Kato Masaru was stabbed several times and died. When he opened his eyes again, he found himself standing intact in a strange room, with a strange black ball in front of him. With Kato Katsu, there are three other people, Shimohira Reika (dubbed by Hayami Saori), Nishi Joichiro (dubbed by Guo Zhihiro) and Suzuki Ryoichi (dubbed by Ikeda Shuichi). Like Kato Katsu, they are all dead. Lei Jia told the confused Kato Masaru that the black ball was called "GANTZ", and all they had to do was wait for the order from the ball. This time, the four were teleported to Osaka. What they had to face was a monster called "Slide" and a grand Hyakki Night Parade. Only by killing all the monsters within the time specified by GANTZ can Kato Masaru get a chance to return to his brother again.