Каталог аниме студии NHK

A song for the Minna no Uta segment, it adapts "Flohwalzer" (Flea Waltz) is a simple German piano piece, often one of the first learned because its fingering is simple and it allows beginners to perform a piece that is harmonically and rhythmically pleasing. It has different names in different countries but in Japan this piece is known as Neko Funjatta (I Stepped on the Cat). (Source: Wikipedia)

Японская версия одноимённой итальянской песни 1968 года.