'Beautiful demon' would translate to 美ã—ã„鬼 (utsukushii oni) in Japanese.
demon blade in Japanese is akuma no tsubasa
ma o
γγΌγ―γγΌγ’γ³
Furasshu no akuma
Hi no akuma
aoi akuma
ma o
youkai, onii, bake-mono
Akuma no Tousen :D
The japanese word of song is "uta"and beautifull is"ii"...so you can say it in japanese..."ii uta"
鬼 /o ni/ is a good Japanese equivalent for what you are looking for.
Ookami means wolf in Japanese and yasha means demon in Japanese. Ookamiyasha means wolf demon in Japanese and yasha ookami means demon wolf in Japanese.