When Yu Lu, a down-and-out maid who had forgotten the past, woke up from a deep sleep, she found that she unexpectedly came to a town called He, and entered He'er School to study. She met the mysterious night maid Ling Chumo, the evil heir Jiang Yu, the human villain Zhang Xiaoyu, high school student An Dongxia... And others. While searching for memories, Yu Lu united his friends to fight against the demons lurking around him, and discovered an incredible truth.