Gakuen Sentai Solblast

Gakuen Sentai Solblast is a tactical RGP that features 5 young girls that have to defeat an evil organization that wants to conquer their residence. The game plot begins explaining that in the beginning there were two brothers that decide to separate and found each of them his own residence chool, but one day one of them the KS organization attacks the other girls residence sending some dragon robot soldiers when that happens the residence school select a girl squadron to face those enemies.

http://www.psxdatacenter.com/games/J/G/SLPS-01852.html