Doinaka is a planet in Episode 124. Keroro is curious about this planet as a child, despite the train are prohibited for children alone, Keroro, Giroro, and Zeroro rides on the train, and hides in the bathroom before departure. They discovered Viper (old) after chased by a conductor robot. The three finally arrived in Doinaka, but it seems to be empty, no aliens living here, but in the present, Doinaka is now populous.
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