This font is from the album cover of "The Party" by Casiopea, a japanese album from 1990. As part of a digitizing of the cover (the original text is reflective ink so doesn't scan), I need help finding this font. I used What the Font to identify it as Liana by Paratype, which led me to Lainie Day, as well as the Mr Lackboughs font. While Lainie Day is REALLY close, the P is different. Apparently there were lots of "ripoffs" of this font. Anybody know which one has this P? Or is it custom? Thank you!

I'd guess custom.