Keroro Gunsou: Mushakero Ohirome Sengoku Ranstar Dai Battle
Japanese title: 武者ケロ　お披露目！戦国ラン星大バトル！！
Type: Special
Source: Manga
Episodes: 1
Status: Finished Airing
Aired: Mar 1, 2008
Duration: 14 min
Rating: PG - Children
Studios: Sunrise
Producers: Kadokawa Pictures Japan
Genres: Action, Comedy
Themes: Mecha, Parody, Samurai
Demographics: Shounen

This was the 14-minute movie that was screened in theaters with Keroro Gunsou Movie 3. It became the prequel to the Mushakero in season 5 of the main Keroro Gunsou anime series. It takes place in Ranstar where the Keroro platoon are up against the Vipers. The whole setting of Ranstar is based on the Sengoku Era of Japan, and all characters are dressed in that fashion.