All 5 members of the Keroro Platoon are reunited, and are tasked with rescuing Fuyuki and Natsumi from a strange alien.
Fuyuki and Natsumi Hinata are introduced as they wake up to find a mischievous Sgt. Keroro spying on them.
Fuyuki and Natsumi Hinata are captured and tied up by Keroro; Aki Hinata is introduced.
Keroro has his own bedroom. Aki tasks Fuyuki with observing Keroro, who is doing his own counter-surveillance.