Kei Kurono (Japanese: 玄野 計, Hepburn: Kurono Kei ) is a fictional character in the manga series Gantz written by Hiroya Oku. In the story, Kurono is a teenager who feels forced to save a man from a subway train alongside his childhood friend Masaru Kato, but is killed in the process. He is revived by a being known as Gantz and with others is forced to fight aliens hiding in human society. Despite starting as a selfish character who does not care for others, Kurono feels more optimistic when he becomes the leader of the team and starts a romantic relationship with a teenaged girl named Tae Kojima. The character is also present in Gonzo's anime adaptation of the series, live-action films and a CGI film, Gantz: O, where his role and fate highly differ from the original manga.