Yarakai Heart (やらかいはぁと, Yarakai Hāto, Soft Heart) is the 15th single from Japanese idol group Idoling!!!.
[1] "Yarakai Heart" used as LittleBigPlanet 2 Japanese release CM song.
[2] The coupling song "Queen Bee ~Shōjo no Jidai Kara~" used as Fuji TV Kiseki Taiken!
Unbelievable ending theme song for January - March 2011[2] and "Konayuki ga Mau Machinami de" used as CBC Otakara Hasshin Tower DAI-NAMO ending theme song.
[2] Yarakai Heart released in three types: