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A sharp-tongued, rule-abiding conspiracy mastermind x a careless maid who claims to be the reincarnation of a famous detective. The "murder plan" without the deceased, the "Jiujiao Pavilion" on the isolated island, the triple reversal, the overly concentrated true soul! Nesara Kazuki is an ardent fan of the late famous mystery novelist Hoarsha, and claims to be the reincarnation of the famous detective Oirase Ryuusei. She currently works as a maid at the Phoenix Hall, the memorial hall of Hougasha. However, everyone in the Feng family seems to be at odds with each other, and the four children have a grudge against each other. The eldest son Chun Mo finds the conspirator Jackal and attempts to kill his sister Bai Xue. In order to prevent it, Feng Ga persuades Jackal to implement a new plan that does not require actual killing. However, on the day of the operation, accidents occurred frequently, and people were actually killed one after another...