While en route to Kuramochi Engineering's labs, Ichika Orimura comes face to face with an unidentified foe who successfully infiltrates the central system of IS Academy, causing it to malfunction. His elder sister, Chifuyu, immediately gathers his comrades - Houki Shinonono, Cecilia Alcott, Huang Lingyin, Laura Bodewig, and Charlotte Dunois - to combat the hacker and restore the damage done. Their solution involves making use of virtual reality technology to enter IS Academy's network. Sadly, the ladies on the team are unaware of the menacing "World Purge" software that springs forth as soon as they step into the digital realm, leading them into ludicrous romantic scenarios with Ichika. Upon his return to IS Academy, Ichika takes it upon himself to liberate the girls from the illusory dimension and bring them back to reality.