While serving as the main theme song for the 1979 series, its main singer was changed five times, from Kumiko Ōsugi to
Satoko Yamano in October 9, 1992, from Satoko Yamano to
Tokyo Purin in October 2, 2002, from Tokyo Purin to
Misato Watanabe in April 18, 2003 and from Misato Watanabe to
AJI in April 30, 2004. The song was then performed by the
Twelve Girls Band instrumentally while serving as the theme song for the 2005 series. The song also managed to achieve the top position for the children's song and TV anime song charts in 1980. After being retired as the main theme, the song was then used as an insert theme in the first two movies of the 1979 series and as an ending theme for the 2005 series in 2006 specials. The song was then made one of the currently used ending songs in April 5, 2019 with a special rendition by all of the current voice actors for the main five characters. ==Notes==