Mikarun X

Synopsis

Somebody wants the Earth! After being invaded for 6 times by monsters and aliens, Tokyo was damaged and almost destroyed. When Runna Minami meets an honor student, Mika Kujiraoka, the bishojo fighters of justice, Mikarun X, are born. They transform themselves in two giants and, without wearing anything, the two heroines fight against the various enemies. (Source: Baka-Updates Manga)