Build a movie plot around this: How are Natsuki and Kasuma related? Cousins
The answer to this question is:
The story centers on high school student Kenji Koiso, a wiz in mathematics but ill-adept socially, who spends his time in OZ, a massive computer-simulated virtual reality world, as a part-time low-end moderator. At the beginning of summer vacation, he is asked by Natsuki, one of the most popular girls in his school, 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 fiance.As Kenji tries to act the part, meets over a dozen of Natsuki's relatives, and deals with Natsuki's "first love" crush on her uncle Wabisuke Jinnouchi, 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 he is the prime suspect. Using Kenji's account and avatar, the real "hacker", which is actually the advanced artificial intelligence system Love Machine, wreaks havoc on the virtual world of Oz which is affecting the real world that is deeply ingrained into Oz' system. With car navigation systems disabled and computer systems malfunctioning, Japan grinds to a halt. With his math skills Kenji is able to crack the passcode and returns control of Oz back to the moderators and Oz' engineers. Meanwhile Natsuki's great-grandmother, Sakae Jinnouchi, uses the level of influence she's created in her 90 years of life and calls various people in important positions in Japan's society and her family who work in various emergency services. She encourages them all to work their hardest, to see through this troubling time of turmoil, reducing the potential chaos and damage that could have occurred. But her actions do not go unnoticed by Love Machine, which leads to an unfortunate tragedy for the Shinohara clan. Although no longer controlling Oz itself, Love...