Description: In the year 20XX... The human race has been under the threat of suddenly appeared extraterrestrial beings called Alter, gradually driven into extinction. Alter's scientific technology enormously outstrips humanity's. There remain almost only women after men died in combats. But people still see a light of hope. Alter's weapons start emitting light as soon as girls grab them. -- A chance of survival may come if fighting with this combination... Surviving ones try to fight back Alter again with new weapons. The girls of the last hope are named: Valkyries.