Gantz

By most accounts, Kei Kurono is a selfish jerk, which makes it all the more interesting when he dies trying to save a stranger from a subway train. Instead of whatever afterlife he expected, he wakes up in a bare apartment with a bunch of other dead people and a giant black sphere called Gantz. The sphere gives them weapons, skintight suits, and a simple order: go kill aliens hiding in Tokyo. If they refuse, they die again — for real this time. This 13-episode TV series from Gonzo leans hard into its seinen roots. It's dark, violent, and genuinely unsettling in ways that go beyond just the gore. The real tension comes from watching ordinary people — most of them confused, scared, and completely unprepared — get thrown into impossible situations where hesitation gets you killed. Kei and his childhood friend Kato handle it in completely different ways, and that contrast drives a lot of the emotional weight. The blend of CGI and traditional animation gives the action scenes a distinct, slightly surreal look that fits the tone perfectly, and the soundtrack keeps everything feeling tense even in the quieter moments. If you liked Deadman Wonderland's high-stakes survival or Btooom!'s death-game premise but want something that leans more into psychological dread and moral ambiguity, Gantz is right in that lane. Just know going in — it doesn't pull punches, and it's not trying to make you comfortable.