I remember picking up this album "miss G" by Naoko Gushima（具島直子）a couple of decades ago, probably because I heard some of the tracks being played on the store speakers...most likely Tower Records. And in all likelihood, one of those tracks was "Candy". As was the case with all of the other tracks, Gushima provided the words and music for this softly bouncy song which the blogger for Japanese-language "Music Avenue" described as being an example of Urban Mellow.
Not sure if Urban Mellow is an actual genre name (a love child of J-AOR and City Pop?), but I guess "Candy" would fit the title. In any case, it is a cafe-friendly tune with Gushima's velvety vocals reminding me a bit of another singer who was in the same ballpark, genre-wise, Toko Furuuchi（古内東子）. "miss G", by the way, was Gushima's debut album from 1996.
There's not a whole lot of information on Gushima unless you go straight to her website...not even a J-Wiki entry. She was born in 1969 in Tokyo, started learning piano at the age of 4, and then at 21, took those first steps into a music career as a backup singer and singer for commercials before releasing "miss G" some years later. According to her website, Gushima has released 5 albums up to now including her latest, which is also her BEST compilation, "magic wave" from 2009.