Koiso Kenji<span>, a eleventh-grade math genius who works in the summer as a part-time computer technician for the </span><em>Virtual World of Oz</em><span>, is invited by </span>Shinohara Natsuki<span>, the most popular girl at his high school to her expansive family's home for a summer job. In the middle of their trip, a hacker infiltrates the network and takes control of Oz, plunging humanity into absolute chaos.</span>