Keroro Gunsou: Mushakero Ohirome Sengoku Ranstar Dai Battle is a special anime that premiered in spring 2008, produced by Sunrise.

About the production: there is 1 episode of about 14 minutes and its current status is "finished".

Its main genres are action, comedy and mecha.

On AniList, Keroro Gunsou: Mushakero Ohirome Sengoku Ranstar Dai Battle has an average score of 58%, an average score, and appears on 464 users' lists.

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.

Official synopsis from AniList.