Mermaid Sisters (Japanese: マーメイド・シスターズ ) is an acapella group who participated in Mars' Brightest. Mermaids the are Quadruplets.
Appearance
Personality
Plot
They appear as contestants for Mars' Brightest. They competed with GGK at the third round of the quarterfinals and was soon eliminated due to the obscene lyrics of their song "Galactic Mermaid".