IS: Infinite Stratos 2 - World Purge

IS: Infinite Stratos 2 - World Purge is an OVA episode of the second season of Infinite Stratos. It tells the story of how, while Ichika Orimura is away at Kuramochi Engineering's laboratories, an unknown enemy hacks into IS Academy's core and cripples its systems. To fend off the attack and repair the damage, his older sister Chifuyu enlists Ichika's harem: Houki Shinonono, Cecilia Alcott, Huang Lingyin, Laura Bodewig, and Charlotte Dunois. Together, they use virtual reality to confront their opponents in IS Academy's network. However, a piece of malware called "World Purge" is activated when the girls enter the digital realm, forcing them into fabricated realities where they experience their ideal romantic bond with Ichika. Once Ichika returns to IS Academy, he must rescue the five girls and wake them from this virtual reality. This OVA further explores the harem and sci-fi elements of the Infinite Stratos series, focusing on the characters’ emotions and the challenges posed by virtual reality.