I had no idea that PSY-S' "Angel Night ~ Tenshi no Iru Basho" (Place of Angels) was used as one of the opening themes for the "City Hunter"（シティーハンター）franchise. It's been on a couple of BEST compilations by the eclectic band but there was no mention of its placement.
In point of fact, "Angel Night" was the first opening theme for Season 2 of "City Hunter" which was followed by Fence of Defence's "SARA". However, the PSY-S contribution to the anime has that energy which starts off another crackling episode. Still, there is no doubt that it is a PSY-S tune. It was composed by Masaya Matsuura（松浦雅也）and written by Yukio Matsuo（松尾由紀夫）, and of course, the amazing CHAKA is on vocals.
"Angel Night" was also PSY-S' 7th single from April 1988. Although it isn't listed on J-Wiki how high the song rated on Oricon, it's difficult to imagine that the song didn't get into the Top 100 during the week somehow. Mind you, I think of the opening and ending themes for "City Hunter" that have been put up so far on the blog, "City Hunter: Ai yo Kienai de"（愛よ消えないで）still comes out on top for me. An album version of "Angel Night" is on their 5th album "Non-Fiction" from August in the same year.
Tarento and illustrator Shoko Nakagawa（中川翔子）brought her own cover of "Angel Night" in 2010 through her album "Shokotan Covers 3 ~ Anison wa Jinrui wo Tsunagu ~"（しょこたん☆かばー3 〜アニソンは人類をつなぐ〜...Anison Will Bring Humanity Together）which peaked at No. 10.