A mystery for me...and for anyone who reads this. I came across this album, "Love Trip" (1982) through the auspices of "Japanese City Pop". Furthermore, I found just one song by Takako Mamiya （間宮貴子） on YouTube, and I'm not even sure if it's been uploaded in its entirety. "Mayonaka no Joke"(真夜中のジョーク...Midnight Joke) is a pretty decent City Pop tune. But despite looking throughout the Net, I haven't been able to find any more information about this singer. Would like to track it down someday, but I've got a feeling that this could be one of the rarest of the rare.
"Mayonaka no Joke" was written by lyricist Ichiko Takehana（竹花いち子）and composed by Hiroyuki Nanba（難波弘之）. Takehana apparently has her own foodie blog.