I mentioned in my first article for Shibata that her voice sounded similar to that of Yagami, but for her version of "Umaku Ikanakutemo", it's slightly more toned down. The B-side to her 3rd single, "Tomarigi" (とまり木...Perch) from January 1978 as well as a track on her 1st album with the same title from February of the same year, "Umaku Ikanakutemo" is delivered as if Shibata wanted to surreptitiously give that advice of not giving into obstacles and not giving up on the road to success. Heck, her lyrics even give a shoutout to The Beatles' "Long and Winding Road". It's the voice of a good friend keeping that air of optimism.
Listening to "Umaku Ikanakutemo", I keep getting reminded of the crazily optimistic Hikari Kohinata in the current anime "Amanchu!"