From the Keroro Wiki
Warrior Kero: Debut! Sengoku Planet Ran Big Battle!! (武者ケロ お披露目!戦国ラン星大バトル!!, Musha Kero Ohirome! Sengoku Ran-sei Dai Batoru!!) is an insert to the feature film Keroro Gunso the Super Movie 3: Keroro vs. Keroro Great Sky Duel de arimasu!
It all starts with the platoon coming to the planet. They meet O-mois, who is like Angol Mois. They find a whole village running away from a ton of Vipers, with Viper (Youngest Warrior) seeing O-mois. As he tries to capture her, he accidentally caught Keroro and Tamama. Tamama farts, getting them out. But viper catches Kururu and they 'sacrifice' him, as he pours curry into his mouth.
