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Synopsis

Dr. Azuma developed numerous robotic entities intended to assist humanity. However, a severe electrical storm caused a lightning strike to his laboratory, which corrupted the core programming of one such robot, designated BK-1. This robot subsequently renamed itself Braiking Boss and declared its intention to subjugate humankind rather than serve it. Braiking Boss then assembled other robotic units into a formidable military force, aiming to enslave the human population. In response to this emerging danger, Dr. Azuma's son, Tetsuya, requested his father to transform him into an indestructible android. This transformation would grant him the necessary power to neutralize the menace inadvertently created by his father. Shortly after this, Braiking Boss successfully captured Dr. Azuma and his wife. Tetsuya, now known as Casshern, embarks on a mission to reverse the course of the conflict and liberate his parents, aided by his companion Luna and his robotic canine, Friender.