Modern day Tokyo collides with BATTLE ROYALE in this thriller where a teenager, Tsubasa Sato, is flung into an alternative Japan, ruled by an tyrannical emperor. He soon discovers that anyone with the last name "Sato" is hunted down game-style by mysterious hunters in black with smiling masks. Tsubasa eventually notices that the parallel world is linked to the real world, killing same person who has already been killed in the parallel world. And when the siren sounds to signify that the Chasing game has begun, he must use all of his cunning not only to survive but to bring an end to the game itself.