The story centers on high school student Kenji Koiso (Ryūnosuke Kamiki), a child prodigy in mathematics who spends his time immersed in OZ, a massive computer-simulated virtual reality world. Kenji is a genius with numbers but ill-adept socially. He secretly has a crush on his attractive upperclassman Natsuki Shinohara (Nanami Sakuraba) but does not have the courage to tell her. At the beginning of summer vacation, he is asked by Natsuki to help in celebrating her great-grandmother's 90th birthday. Although Kenji does not know the details of the plan, he agrees and goes with Natsuki to her grandmother's estate in Ueda, Nagano Prefecture. Much to Kenji's surprise, he is introduced at the Shinohara family house as Natsuki's fiancé.
As Kenji tries to act the part, meets Natsuki's dozens of relatives, and deals with the advances of computer expert Wabisuke Jinnouchi (Ayumu Saitō), Natsuki's uncle and "first love", he receives a mysterious e-mail with a mathematics code. He cracks the code and returns it to the sender but finds himself at the center of a developing news story the following day. Overnight, OZ has been hacked and turned into a digital deadzone, and he is the prime suspect. Using Kenji's account and avatar, the real "hacker", which is actually the advanced artificial intelligence system Love Machine, has stripped the virtual world empty and wreaks havoc in the real world. With car navigation systems disabled and computers malfunctioning, Japan grinds to a halt. Love Machine also gains control of a satellite and threatens to send it crashing into a nuclear power plant somewhere on Earth. In order to fight back, Kenji enlists the help of Wabisuke, Natsuki's family, and his best friend using an army of avatars. With the fate of the world at stake, a great online summer war takes place.
. Bất ngờ, Natsuki rủ Kenji về quê mừng thọ bà. Trong chuyến đi ấy, 1 tin nhắn đc gửi vào đt của Kenji. Trong tin nhắn là 1 bảng số với hàng ngàn số... Với danh hiệu thần đồng toán học, Kenji đã giải đúng bài toán đó và đó chính là lúc rắc rối ập tới cho tất cả mọi người trong thế giới OZ [thế giới mà Kenji đang điều hành] và cho cả nhân loại... Diễn biến khá hấp dẫn. 1 phim bom tấn hè 2009...
