Story
OVA by Tatsunoko Production — Summer 2013, 10 episodes, Finished.
After an incident at Mount Fuji unearths the slumbering Dragotron, Demon Emperor of the Predacons, his minions known as the Four Oni subsequently awaken and seek to restore their unconscious master to full power. To do so, they must obtain five mystical items known as the Legendiscs, which have been hidden away. However, in response to their awakening, two three-member teams of Autobot combiners, each belonging to a subgroup called the Swordbots, have likewise been summoned to counter this new Predacon threat.
Synopsis via AniList (English).
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