While Aiba is hanging out in a chatroom, a hacker infiltrates it and leaves a message telling the members within to log into Cyberspace EDEN, a popular physical-interaction cyberspace network, to receive a "wonderful present". Although most of the room members declare it to be too suspicious to involve in, Aiba, along with users "Akkiino" and "Blue Box" decide to look into it. Aiba meets them the next day as arranged in Coulomb, a hacker-infested...