Fantasy anime feature about a teenage boy who moves to Nagano with his crush, in order to fool her 90-year-old grandmother into thinking that she is engaged. Kenji (voice of Ryunosuke Kamiki) is a shy eleventh-grade student when he is asked by the confident, older pupil Natsuki (Nanami Sakuraba) to take a summer job at her home. Upon arriving, he is shocked to learn that the job requires him to pose as Natsuki's fiancé. Their romance is interrupted, however, when Kenji receives a mysterious text message containing a mathematical problem. Being a maths whiz kid, Kenji can't resist solving it, but he soon realises disaster has struck - he has caused the seizure of a huge social networking site that is used by most of the world's businesses and services. It is now up to Kenji and his newly-acquired family to put things right...
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