For some reason, that reminded me of this great Chisato / Princess Princess collaboration from 1991:
Classic clip! Chisato and Puripuri are contemporaries, debuting around the same time (late 1980s). Chisato and P2 lead singer/songwriter Okui (now Kishitani) Kaori were paired up on TV many times, performing each other's hits.
Puripuri got back together a couple times since their official breakup in 1996 and man, Kaori's vocal range is still on target!
Finally: "Diamonds" is probably the best-known song in the P2 catalog. I only wish they did this TV spot a year later when some of Chisato's more famous tunes were released. I mean, "Teriyaki Burger" is a good peppy song and all but... What *was* the staple Chisato song in 1991? Ame is great but it's a ballad, doesn't really match with "Diamonds." "Fight!" or "Kono Machi" might feel corny" How about "Kusai Mono ni wa Futa wo Shiro!!" Kanako would have a good time ripping through that song!