This was her 15th single and up to now, it remains her last No. 1 song; Watanabe has two No. 1s, the other one being her 4th single "My Revolution"in 1986 (already profiled). However, no need to be sorry since she's had a lot of her singles penetrate the Top 10.
Her lungs were, and hopefully still are, mighty powerful. The song was also a track on her 6th album, "Tokyo"(released in July 1990), which also hit the No. 1 spot on the album charts. The song itself became the 58th-ranked single in 1989 while "Tokyo"became the 4th-ranked album of 1990. (Thanks again to musictvprogram.com for the rankings information)