Sgt. Frog, Volume 15, Sgt. Frog Series, Mine Yoshizaki
When Fuyuki wakes up to find a froglike alien in his bedroom, he's delighted-after all, he's head of his school's occult club. But poor Sergeant Keroro is now stranded without his squad in a failed invasion of Pokopen (Earth), forced to feign bonhomie as he does housework for the Hinata household to earn his keep. Keroro, called "that stupid frog" by big sis Natsumi, perfects his cleaning techniques while replotting his invasion and building Gundam models in his basement quarters. Then one by one...
