I know a Japanese band who cover the full ANATO (iirc)on the live stage, but I don't have any clue about any album of Queen songs covered by any Japanese band. Besides, I know a Japanese male opera singer who is a huge fan of Freddie (sometimes he has moustache! )and I've heard him sing Queen songs several times on TV, but as far as I know he hasn't released any album full of Queen songs.
Maybe someone who knows a lot more would answer for this...
sorry...I have some info.
I recall three bands and their names are Kween, Opera and JOUSAMA(meaning Queen in Japanese).
I think we can hardly get two of them except Kween.
I'm searching more info..
As for Opera see this below; link
As for Kween see this below link link link
As far as I know, "Cheers!" is their original tune.