They left their world to protect ours

Danger Dolls

A quartet of cute idol singers moonlight as butt-kicking action heroines. When extraterrestrial invaders threaten the safety of the Earth, after an earthquake unleashes them from an alternate dimension, the Danger Dolls become humanity's only hope for survival. The team infiltrates the evil cult behind the invasion and must use their swords and their fists to smash the invading army.