This is episode 0, the prequel to the main Keroro Gunsou anime series. KeroZero was shown in theaters with Keroro Gunsou Movie 4.
Japan
15 minutes
2009
1966
5.8
2007
6.5
2007
6.5
2010
7.0
2009
0.0
2012
4.9
2003
0.0
2011
4.0
2010
6.5
1910
5.8
1910
5.5
1910
4.0
1989
6.5
2017
0.0
2023
0.0
1988
0.0
2020
7.8
2023
0.0
1999
7.8