Marukaite Chikyuu (まるかいて地球) is the first ending theme for the Hetalia anime, originally sung by the character of Italy. Official versions of this song sung by various characters were released. Official versions other than Italy are Germany, Japan, England, France, America, Russia, China, Chibitalia, Holy Roman Empire, Switzerland, Liechtenstein, Poland, Lithuania, Austria, Prussia, Spain and Sealand.
In the fandom, there are many unofficial variations of this song. There have been alternate versions of the song, as well as covers in alternate languages, and sometimes both. There are unofficial versions of characters who already have official versions released. There are fan versions for official characters who do not have an official version, and there are versions for countries who do not have an official Hetalia character counterpart. Overall, there are many variations of the same song.