If your teenager is obsessed with anime but tired of magic high schools and giant robot battles, 91 Days offers a sharp detour. It plays out like a classic 1970s gangster movie drawn by Japanese animators: gritty, deliberate, and entirely unconcerned with making its protagonist likable.

The story follows Angelo Lagusa, a young man who watched the Vanetti crime syndicate murder his family during Prohibition. Years later, he returns under an assumed name, befriends the mob boss's son Nero, and methodically sets rival factions against each other to bring the house down. It is smart, cynical, and remarkably disciplined across its 12 episodes.

Keep younger kids far away from this one. The violence is up-close and personal, and the emotional register stays somewhere between depressing and grim. For a mature teen who can handle the body count, it delivers a genuinely compelling drama about the ruinous cost of holding a grudge.