人类制造出了机器人作为他们的帮手，但机器人却最终背叛了人类，夺走了地球的统治权。就在人们被逼的走投无路之时，一位名叫露娜（矢岛晶子 配音）的少女成为了他们最后的希望。邪恶的机器人统领布莱金（内海贤二 配音）感受到了露娜所带来的威胁，派出了强大的机器人杀手追杀露娜，卡夏（古谷彻 配音）就是其中之一。最终，露娜死在了卡夏的手上。 露娜死后，整个世界开始迅速的衰败，一晃眼数百年过去，无论是人类或是机器人，都早已经不复存在。就在此时，卡夏再度现身，只是此时的它已经失去了曾经的记忆，在黑暗和混沌之中只剩下迷惘。The world is falling apart and Casshern is to blame. He is said to have killed a robot named "Luna" and by doing so unleashed a plague referred to as "ruin". But Casshern has no recollection of committing such an act, none the less both the humans and sentient robots hold him accountable. Now he must struggle to unravel what has truly happened to the world to be able to make a mends for his sins.
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