To defeat the Planetary Gears once and for all, the Midsummer's Knights prepare to depart for Uranus in order to destroy the enemy spaceship and render them powerless as part of their master plan, the "Operation Summer". However, Ai, disguised as a model on a PR event, infiltrates the Tenkaido space station to stop them, and the situation gets even more hectic when Salty Dog makes their move as well.