Sgt. Frog, known in Japan as Keroro Gunso (Japanese: ケロロ軍曹, Hepburn: Keroro Gunsō; lit. 'Sergeant Keroro'[a]), is a Japanese manga series written and illustrated by Mine Yoshizaki. It was launched in Monthly Shōnen Ace in April 1999. The story follows the attempts of a platoon of frog-like alien invaders to conquer Earth. Sergeant Keroro, the titular character, is the leader of the platoon, but is at the mercy of a human family of three after being captured by them. Keroro is forced to do meaningless chores and errands for the family after his army abandons his platoon on Earth.