Moumoon - Wikipedia, the free encyclopedia Moumoon (stylized as moumoon) is a group formed by YUKA (Vo./ Lyrics) and Masaki (Gt./Composer) 『moumoon』 is a made-up term with a French word "mou (soft)" and "moon": soft moon. They met at a summer rock festival about 10 years ago. A few weeks later, YU
