The movie Casshern is set in a dystopian future where the world has been devastated by war and environmental disasters. There are two main factions: the Great Eastern Federation and Europa, which have merged to form Eurasia. However, the war between these two factions has left the earth in a desolate state, with much of the land uninhabitable due to radiation and other effects of the war.
In this bleak scenario, Professor Azuma, a scientist, develops a revolutionary new technology called "neo-cells" that can regenerate human tissue and cure many of the diseases that have ravaged the world's population. Azuma's son, Tetsuya, is killed in the previous war, but the professor experiments on his body using the new technology to bring him back to life as a powerful cyborg named Casshern.
However, the experimental neo-cells also have unforeseen consequences, giving rise to a group of mutants who are hostile to humans and intent on wiping out the remaining population. Casshern is forced to confront these mutants and protect humanity, even as he grapples with his own identity and his relationship with his father.
The movie is a live-action adaptation of a Japanese anime series from 1973, which has since become a cult classic. The film combines elements of action, science fiction, and drama, exploring themes of technology, humanity, and the consequences of war. It features striking visuals and intense action sequences, as well as a haunting and melancholic soundtrack that adds to the mood of the movie.