Keroro helps clean the house with Natsumi and Aki, an then helps Fuyuki clean up his rather large book collection.
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.