I read the translations for this way back when even the *concept* of scanlations wasn't around yet. Yeah. Old school text translations. I'm not sure if it's since been picked up, but I still want to look for it.

I think the title had something to do with blue stone? The manga is probably early to mid 90s, and was a series. It was about angels, the main characters being Mikael and Fillanzia, and the power of a mysterious and powerful blue stone that I think Mikael has in his possession? I think Fillanzia was the happy-go-lucky one who was really attached to Mikael....

Sort of like Shuw Morimoto's Asterisk, I guess.

I would love if anyone is able to help me out! It's been bugging me for a while! (And Google won't turn up with anything. )

And I think it had the word Sonata in it?

Totally guessing here, but could it be this: Matendou Sonata

The "blue stone" thing suggests it might be Lapis Land Sonata.