Battle girl high school collectionmysterious invaders have attacked the earth'! '.strtoupper('a')s the irousu roam the conquered lands, mankind has been driven back, but there's one last weapon that may still turn the tide super powered schoolgirls'! '.strtoupper('a')t schools like the shinjugamin girls academy, elite classes of star guardians alternate between regular schoolwork and learning to kick irousu behind'. '.strtoupper('i')t's a duty that the members of the shinjugaminehoshimori force, like freshman miki hoshitsuki, take seriously, but as they're basically normal girls who just happen to get their powers from a magic tree, there are normal life issues they have to contend with as well'. '.strtoupper('w')ith the arrival of their latest mysterious recruit, however, things are about to get deadly serious'. '.strtoupper('t')heir final exam is about to begin and if they fail, the whole world is doomed.