Sergeant Keroro Chibi Kero: Secret of the Kero Ball!?
Sergeant Keroro Chibi Kero: Secret of the Kero Ball!?2007
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Sergeant Keroro Chibi Kero: Secret of the Kero Ball!?
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Tells of the adventures of a young Keroro and Giroro back on Keron when they get trapped inside a prototype Kero ball.
No cast listed.