Summer Wars

I sat watching this having bought this about a week ago.
Available on blu ray and dvd as well as a double pack with The Girl Who Leaped Thru Time which is by by the same director Mamuro Hosoda, this is about romance, family life and a cautionary note on putting technologically speaking all your eggs in one basket.
We begin the story with timid eleventh-grader and math genius Kenji Koiso who is asked by older student and secret crush Natsuki to come with her to her family's Nagano home for a summer job.
Kenji agrees without hesitation. Natsuki's family, the Jinnouchi clan, dates back to the Muromachi era, and they've all come together to celebrate the 90th birthday of the driven matriarch of the family, Sakae. Kenji upon arriving discovers his summer job is to pretend to be Natsuki's fiancé and dance with her at the birthday celebration. As Kenji attempts to keep up with Natsuki's act around her family, he receives a strange math problem on his cell phone which, being a math genius, he can't resist solving. Little did he realize it turned out to be the solution to the mysterious equation that causes a hijacking of the social networking site through which most of the world's social and business traffic flows.
Kenji and family have the difficult task of putting right this AI created situation.
This is one anime that never lets up to the last minute keeping you on the edge of your seat and is strongly recommended.