Genres: Action, Comedy, Thriller
When timid eleventh-grader and math genius Kenji Koiso is asked by older student and secret crush Natsuki to come with her to her familyís Nagano home for a summer job, he agrees without hesitation. Natsukiís family, the Jinnouchi clan, dates back to the Muromachi era, and theyíve all come together to celebrate the 90th birthday of the spunky matriarch of the family, Sakae. Thatís when Kenji discovers his ďsummer jobĒ is to pretend to be Natsukiís fiancť and dance with her at the birthday celebration. As Kenji attempts to keep up with Natsukiís act around her family, he receives a strange math problem on his cell phone which, being a math genius, he canít resist solving. As it turns out, the solution to the mysterious equation causes a hijacking of the social networking site through which most of the world's social and business traffic flows.