Gantz

Hiroya Oku's Gantz, serialized by Shueisha from 2000 to 2013 across 37 volumes, is a landmark of dark, adult-oriented science fiction manga. The series follows a group of people who, after dying, are forcibly teleported to a mysterious room and equipped with advanced weaponry and suits, then compelled to hunt down and kill alien threats. Oku's unflinching, hyper-detailed art and the story's relentless, brutal unpredictability made it a defining work of the 2000s, influencing countless creators and pushing the boundaries of what a mainstream battle manga could depict.