Invaders of the Rokujouma!?

Our Knight

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...