During a rare moment of peace, Casshern presses Ohji for the story of Ringo’s origins. Elsewhere, Dio and Leda cross paths with two deadly robots that were once the strongest of their kind.

Casshern awakens to find his world reduced to a corrosive wasteland. Lost in a future he does not recognize, he struggles to stay a step ahead of those who wish death upon him.

An encounter with the mysterious Lyuze offers Casshern a fragmented glimpse of his role in the Ruin. After stumbling upon a community of “dying” robots, he discovers the true depth of his infamy.

Dying robots far and wide herald the saving grace of Luna. Meanwhile, Lyuze is disturbed to notice that Ringo has begun to rust, and Casshern is confronted by the monster who ordered him to Ruin the world.

Ringo’s attempt to comfort Casshern leads her into a deadly trap. Ohji is quick to come to her rescue, but for them both to escape alive, Casshern must fight Dio as Braiking Boss looks on.

Casshern, Lyuze, and Ringo finally reach Luna’s castle, where they find countless robots hoping to be spared from the Ruin. Dune is among their ranks, but Luna’s treatment of her former protector is shocking.

Leda tries to convince Dio to accept Luna’s healing, but eternal life is no longer his obsession. Dio now lives only to fight Casshern - even if their battle ends in his own destruction.

Casshern and Dio continue their epic final battle. Although only one will survive, they’ve embraced the chilling reality that fighting is the sole purpose of their tragic existence.

Casshern and his friends enjoy the peace of their new lives until the Ruin destroys their happiness. Driven by grief, Casshern sets out to settle the score with Braiking Boss - and issue a warning to Luna.