Highlander

In a flooded future where the ruins of New York lie submerged, the immortal warrior Colin MacLeod embarks on an epic quest for vengeance. Haunted by the ghost of his wise-cracking bard companion, Amergan, he pursues the tyrannical immortal Marcus Octavius, who rules from a solitary fortress and holds a dark connection to MacLeod's tragic past.

The anime masterfully blends Celtic mythology with post-apocalyptic sci-fi, exploring themes of eternal conflict, the burden of immortality, and the cost of obsession. As MacLeod navigates this dangerous world, he is torn between his personal hunt for justice and the desperate plight of the survivors struggling in Octavius's shadow.