Keiko giving us some Christmas goodies at the end of the year!
Her online game is far superior to all the other singers I must say. She has over 40k subscribers on YouTube due to her popularity but also her content output. She's probably monetized there too, maybe?
Just rewatching the FST anniversary performance of RYB and it seemed that the guitarist there was the same one that played with Keiko in her Christmas live and I guess is her guitar teacher/recent acoustic solo live collaborator.