I guess it's time to add another Minako to the "Kayo Kyoku Plus" roster. And like Minako Yoshida（吉田美奈子）, she also belongs in the City Pop genre.
Found this one purely by accident a number of days ago. Minako Ito（伊藤美奈子）is a singer-songwriter from Tokyo who was inspired by Mayumi Itsuwa（五輪真弓）and Mariko Takahashi（高橋真梨子）when she was in junior high school, according to J-Wiki and the footnote from the liner notes of her debut album "Tenderly", and so she started on her path toward a music career.
Not quite sure why this particular song "Derringer" is named after a famous gun since I couldn't catch all of the lyrics (can't find them online) but it was a track from her 2nd album, "Sasoi Gyotou" or "Yuu Gyotou"（誘魚灯...Inviting Fish Lights）from March 1984. Still, it's got that nice City Pop beat with the tight horns and mellow keyboards. And yes, I also like the album cover. Shun Taguchi（田口俊）wrote the lyrics while Ito and Jin Kirigaya（桐ケ谷仁）composed the music.
I've just heard another one of her songs on YouTube. Will most likely cover that next month.