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Tokine Amino works as a secretary for TEN2, an advertising agency. One day while cleaning the conference room, she is surrounded in light and finds she can't leave the room until she solves a puzzle. It seems a creature named Hacchin is a being from another dimension called Quizn. He is interested in the intellectual pleasure that happens when someone solves a puzzles or uncovers a mystery. And he has his sight set on Tokine Amino.