This song belongs to INNA’s first EP, called ‘Summer Days’.
It was released as promotional single on September 22nd 2014, for its digital download and on InnaRomania (INNA’s official YouTube channel).

https://www.youtube.com/watch?v=0KSfxH7Ixpo

It’s also the seventh track from INNA’s Japan-Only Album “Body And The Sun”.