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Introduction to Volume 1: An Onmyoji and a Demon (?) A girl's Taisho bizarre romance! When she was in the first grade of elementary school, her whole family was involved in an accident. Nabana Koyoha has a past in which she was the only survivor. Now in her third year of junior high school, she is back again. When she passes by the accident site again in her third year of junior high school, she somehow finds herself in the Taisho Era! There, she meets Mao, a boy who is a Yin-Yang master. The ne...