Orizunaru Sumairu (Original Smile) - S2.E6

The second attack on the Harvest mother ship has failed, although now Hibiki and the others have a ray of hope in the form of a way to penetrate the mother ship's defenses. Forming a plan around Parfait's limited ability to stop the machine-controlled Harvest fleet, Hibiki and the others launch one last, desperate attack on the mother ship, using Pyoro to upload a virus directly from the mother ship's core. Now the Vandreads must defend the little NAVI robot as he struggles to do his job - but the new enemy form is not far behind...