After the sudden disappearance of his family, Levi Kurose searches for them desperately, seeking help wherever he can. By sheer chance, he stumbles upon the Grim Archives—a peculiar library-restaurant hybrid that, while appearing ordinary at first glance, holds a far more intriguing secret. Among its shelves lie the so-called Mysterious Archives. Driven by a mix of hesitation and hope, Levi decides to ask someone inside for help. Unbeknownst to him, this moment would mark the greatest turning point of his life, the beginning of his journey into the hidden truths of the world, and the unraveling of an ancient power known as the Zen'en Art.