While invading Earth, Kahm runs across Tetsuya, a primitive but cute human and decides to marry him... A biomechanical battleship commanded by Calm, the princess of St. Evascurese, attacks the Earth. The strength of Princess Calm, who descends to the surface and fights with a sword, is not half-hearted. Tetsuya, who was filming her battlefield, fell in love with this princess and got married. The two go to Calm's father, the emperor, for consent to marry, but of course they are in fierce opposition. What is Calm's bold plan for the angry emperor?