The Armoured DEMON follows the story of Takashi, a 16-year-old boy in a futuristic Tokyo who transforms into a powerful demon after encountering a rare blood moon. With his new identity, Takashi battles inner demons and external threats while running from his ruthless father. Supported by his brother Kaito, his childhood crush Rin, and his alien pet Piggy, Takashi uncovers dark secrets about his family and the cosmic forces shaping his destiny.
The first arc climaxes with Takashi defeating his corrupted father in a dramatic battle, revealing his true power and confessing his feelings to Rin — but the war for the universe has only just begun.