Got Kengo Kurozumi's（黒住憲五）2nd article here as one of those mysterious singers who I could only find out about through "Japanese City Pop".
I swear that listening to "You and Me" which is a track on his 5th album "Pillow Talk" from 1989, the groovy orange mimosa-friendly tune was something out of the mid-1980s or even earlier. The arrangement might be more updated but I could feel the Tatsuro Yamashita（山下達郎）in there. The music was by Kurozumi with lyrics by Dereck Jackson.
With all those horns and guitar in there, I think this would have been something that Sing Like Talking could have done this as well. And what a group of session musicians in there: Jeff Porcaro and Michael Landau among others. Another one of those feel-good summer songs.