It is the Game of Thrones of anime. It redefined what a "popular" series could be—bleak, political, and morally gray.
It handles the concept of time travel better than almost any other media. The first half builds characters, and the second half is an intense thrill ride of consequences and despair.
It is the weird, violent, horny, and heartbreaking cousin of Jujutsu Kaisen . Creator Tatsuki Fujimoto writes like a film director—cinematic and unhinged.