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Teenage math whiz Kenji Koiso agrees to take a summer job at the Nagano hometown of his crush, Natsuki. When he arrives, he finds that her family have reunited to celebrate the 90th birthday of their matriarch. His job: pretend to be Natsuki's fiancé. Meanwhile, his attempt to solve a mathematical equation causes a parallel world's collision with Earth.
Batman, along with many of his allies and adversaries, finds himself transported to feudal Japan by Gorilla Grodd's time displacement machine.
When an island half-disappears from the face of the earth, a mysterious organization sends out invitations for a tournament to every skilled fighter in the world. "If you win you can have ANYTHING you want," they claim. They're recruiting only the best to fight the best and claim the title of The God of High School. Jin Mori, a Taekwondo specialist and a high school student, soon learns that there is something much greater beneath the stage of the tournament.
