Tatsuya’s home network has been hacked, leading him to suspect that the culprits are after his research for the Thesis Competition. Also fearing that industrial spies could target their thesis, Mari decides to assign bodyguards to Suzune and the others. It is just as they both predicted, and suddenly there are people shadowing them, or else infiltrating the school by way of peculiar spells. Around that time, Erika’s elder brother, Toshikazu Chiba is investigating a series of unlawful entries into the country in Yokohama and Yokosuka. It is then that someone quite unexpected requests his aid....