Dolmen X

Leader, Ichii, Nii, Sai, and Yoi are aliens who have come to invade Earth. They are looking for a way to invade the planet without having war. To make themselves feel better, Yoi takes the group to a live male idol group concert. The aliens are impressed and decide to become top idols to invade Earth. They call their idol group 'Dolmen X.' (imdb)