* Based on a light novel series by Yumizuru Izuru, illustrated by Okiura.

The students at the IS Academy are trained to become pilots for the Infinite Stratos (IS) weapon system. And Orimura Ichika is the only male among the otherwise female students at the academy capable of piloting an IS.

LingYin feels a bit down at the restaurant. Dunois teases her by pointing out that this is probably due to Ichika's absence. He is presently helping out at the Centre of Research Kuramochi. Suddenly there is a power outage, the security generators do not activate, and the building closes the shutters, but there is no alarm.

Chifuyu, in charge of class, calls on those with a personal IS: Bodewig, Dunois, Alcott, Houki, and LingYin; to enter the underground base. Chifuyu explains that as of now all the school's systems are inoperable, and probably have been hacked. No student seems to have been hurt, but regaining control has the utmost priority. So the girls are asked to connect with the IS Core Network, to restart the network.

They encounter a program called World Purge that sends illusions to all the girls about their ideal fantasies. Meanwhile Tatenashi is tasked to hold off the incoming armed attack on the school.

— written by foo2

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Prequel: IS: Infinite Stratos 2