Keroro Gunsou: Mushakero Ohirome Sengoku Ranstar Dai Battle

After neglecting their invasion reports, Keroro and his platoon are handed a punishment disguised as a training mission: travel to Sengoku Ranstar and defeat the Musha Vipers roaming the planet. Failure means they will not be allowed to return to Earth.

Dressed as warriors from Japan's Sengoku era, the usually chaotic platoon has to survive a battlefield of old-fashioned armor, strange contraptions, and Viper enemies while somehow working together long enough to complete the mission. For Keroro, even disciplinary training quickly becomes an excuse for a wildly unconventional campaign.