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His name is Chang Qiu, the teacher of Dragon Maid, a otaku who lives in seclusion in the mountains. He was happy and peaceful, until the crazy dragon and the bruised magical girl appeared at the door of his house, breaking his years of otaku life. Because he could kill a giant dragon in seconds, he was forced to become his disciple by a girl with dragon blood. However, the ideal life of a dragon maid did not unfold. Facing the successive assassins from another world, he had to return to the world called Kain with the girl to end a war that could not be ended two hundred years ago.