The peace after Talpa feels earned, so Shikaisen's arrival hits different, he's not another world-ending god, just a sorcerer who knows exactly what the armors are worth, and he wants them. The OVA trusts you remember who these four are and lets them be themselves in downtime before pulling the rug out. It's a story about the cost of being the only ones who can fight, told in two episodes with the clarity of something that knows its own ending.

Peace has finally settled over the world following Talpa's downfall, and the warriors are ready to enjoy normal lives. Ryou celebrates his birthday, Kento wins the lottery, and Sage has gone to America to study. Their happy mood ends when news reports surface of a strange killer in New York wearing armor that looks all too familiar. The warriors travel there to investigate and run into a new and sinister foe. An ancient sorcerer named Shikaisen has learned of the armors' power and means to take them for himself, and the others must fight him to save Sage's life.