Science and Technology are truly miraculous things -- except when in the hands of a super-genius super-jerk like the Keroro Platoon's recently recovered tactical officer, Sergeant Major Kululu. Already, Kululu is developing biochemical weapons that no Earth medicine can combat, and rays that can turn the entire planet into helpless children! But where can a fugitive alien find test subjects for such diabolical weapons? Where indeed but the Hinata household! Meanwhile, Private Tamama and Angol Moa vie for the Sergeant's affections, Momoka vies for Fuyuki's affections, Natsumi enters a swimsuit competition, and a frog of the fairer sex appears on the scene...
- Encounter XXI: Welcome To Radio-Free Keroro
- Encounter XXII: Natsumi's Number Is Up
- Encounter XXIII: General Mom's Charge To Relive Her Youth
- Encounter XXIV: Operation: Swimsuit Issue
- Encounter XXV: A Horror Showdown!
- Encounter XXVI: Lady Moa Grows Up Fast
- Encounter XXVII: Enter the Other Momoka!
- Encounter XXVIII: Momoka Platoon Strikes Back
- Encounter XXIX: A Very Keroro Christmas
- Bonus Encounter: Sumomo: A Mission of Love