The single itself didn't go much higher than No. 30 on the Oricon charts, although the album that it later came on, "University Street", went up to No. 17 on the album charts, pretty respectable for a sophomore effort. In fact, it seems that her albums have been getting more of the love than the individual singles; case in point, Takeuchi had to wait until her 20th anniversary in the business in 1998 to finally get that No. 1 single, "Camouflage", although "Single Again" came pretty darn close a decade previously.
Not quite sure where the retro sound originated from, although I am curious. Was it from her parents' collection of old American LPs? Or could it have been from her 1-year stay in Illinois as a high school student?