Black Cat

Known in the underground world by the codename Black Cat, Train Heartnet is an assassin so efficient that his codename means you're already dead if he's been sent for you. He works for Chronos, a shadowy organization that basically runs the world from behind the scenes, and he's one of their top killers, the Chronos Numbers. Cold, precise, zero hesitation. Then one night he meets Saya, a bounty hunter who's basically his opposite — cheerful, free-spirited, the kind of person who talks to stray cats and means it. Their unlikely friendship starts cracking something open in Train, and he begins questioning whether this whole "obedient weapon" thing is really how he wants to spend his life. The fallout from that decision drives the rest of this 23-episode TV series into some genuinely fun territory — gunfights, betrayals, oddball allies, and a power system built around rare Orichalcum weapons and unique abilities that keeps the battles interesting. Taku Iwasaki's soundtrack gives the whole thing a cool, moody edge that fits the tone well. If you liked the wandering gunslinger energy of Trigun or the "assassin with a past" setup of Gungrave, this scratches a similar itch. It's also got some of that Cowboy Bebop lone-wolf coolness, though it leans more into shounen action territory than noir. Studio Gonzo's animation holds up decently, and the character designs are sharp. Worth your time if you're into stylish action with a redemption arc at its core.