When Ichika Orimura heads to Kuramochi Engineering's labs, an unknown adversary infiltrates IS Academy's core, causing a system breakdown. To combat the threat and restore functionality, his elder sister Chifuyu calls upon Ichika's circle of admirers: Houki Shinonono, Cecilia Alcott, Huang Lingyin, Laura Bodewig, and Charlotte Dunois. Together, they dive into a virtual world within IS Academy's network to confront the attackers. Little do they realize that an insidious program called 'World Purge' activates upon their entry, trapping them in alternate romantic scenarios with Ichika. As Ichika reemerges at IS Academy, the onus falls on him to save the girls from the digital illusions they are ensnared in and bring them back to reality.