Invaders of the Rokujouma!?

Season 1, Episode 7: Our Knight

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Theia gives Koutarou special training for the Blue Knight role in the play. Someone unusual shows up to the stage, though... Then one day, there's a malfunction and Koutarou gets hurt protecting Theia. Clan appears and contests Theia over the thrown. There's a fierce battle between the two rivals, but there's another crisis brewing over Hercules, the beetle...