Sio Ogura is a shy misfit who�s always dreamt about ancient battles. But life takes an explosive turn when her school field trip is interrupted by an outbreak of Evolutionary Invaders: hideous alien creatures hell-bent on nuking the planet. Soon, Sio discovers that she�s an e-gene holder: the reincarnation of a historical figure capable of summoning special weaponry. Possessed by the spirit of legendary warrior Oda Nobunaga, Sio joins forces with other e-gene holders on a high-octane alien shooting spree!