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Mutsumi Nishikawa, also known by her stolen identity as Masuyo Mamiya, is the main antagonist of The Old Blue Castle Investigation Case of the Case Closed franchise. She is the former housekeeper of the Mamiyas and lived under the name Masuyo Mamiya for several years, after killing her.
She was voiced by Hisako Kyouda.
Biography[]
Five years ago, Mrs. Mamiya, the eldest daughter of Mamiya Family, returned from oversea to celebrate her mother's birthday. However that night, Mutsumi set a fire in a nearby tower, killing 15 people. Mutsumi Nishikawa took advantage of Masuyo's murder and underwent cosmetic surgery to change her entire face. After this operation, she could easily slip into the role of the late Masuyo Mamiya. Luckily for Mutsumi, she also shares the same voice as Masuyo. Mrs. Mamiya wanted to fire Mutsumi before she died, causing Mutsumi's hatred and greed for the treasure to grow.
When Conan, Professor Agasa and the Detective Boys are resting in the Mamiyas' castle, Katsuo Tabata, the gardener, tells them the story. Conan then deciphers the message on the chessboard. Mutsumi finds out about Conan and knocks him unconscious. Other victims of Mutsumi are Professor Agasa and Genta. Later, Ai and the others judge her. An important reference point for her transfer is her passport. The then 80-year-old Masuyo Mamiya never left the castle, but Mutsumi knew about the passport's new color and size. Just when she is about to escape, Conan guides her to the treasure. It turned out that the treasure she had been searching for for several years was the old castle and the beautiful scenery it provided a view of. At this revelation, Musumi broke down in dismay at having committed mass murder and destroyed her face for nothing.
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