I realized that I have never once encountered a yaoi or shonen ai manga that involved celtic folklore. You know, faeries and such. Anyone know of any series like that? I'd be fine with novels too (such as the tithe series by Holly Black and several PL Nun titles).

This contained the category fairies, so I am assuming it has something to do with them. Just don't know how much though....

Hachiue no Juunin

I think it's best if you just look at the fairies/magic categories and go from there. O_o