Kenji Koiso, an eleventh grade math genius, agrees to take a summer job at the Nagano hometown of his crush, Natuski. When he arrives, he finds that her family have reunited to celebrate the 90th birthday of the family matriarch. His job is to pretend to be Natsuki’s fiancé. Meanwhile, his attempt to solve a mathematical equation causes a parallel world’s collision with earth.

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The story begins with a math genius high school boy Kenji and his
secret idol Natsuki going back to her hometown Nagano to celebrate her
great grandmother's 90th birthday. One night, Kenji unintentionally
helped crack the security code of a second life net community called
“OZ” where billions of users communicate and live. Eventually a single
password crack in virtual reality caused an enormous dis
5b4
aster to the
real world. And young hero and heroin, and heroin's families are united
and determined to fight against their overwhelming enemy.

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