In a small rural town, a brother and sister goes missing and there's also a serial killer case involving woman as the victims. Mayu Misono (Aya Omasa) is a sophomore high school student in the town. She is called "Ma-chang". When Mayu Misono was young, she was also kidnapped and locked up. Since that time she has been traumatized and has become indifferent to everything around her. One day, in front Mayu's mansion, her childhood friend Mii-kun (Shota Sometani), who was kidnapped with Mayu, suddenly appears. Ma-chang hugs Mii-kun. Up until now, she has waited for Mii-kun. Mayu has lived in the mansion alone, until a week ago, when she kidnapped two elementary school aged kids and has kept them locked in her mansion. To hide Mayu's crime, the four of them will live together in the mansion. The truth of what happened 10 years ago becomes slowly revealed. The reason Mi-kun tries to protect Mayu, even puts his life at risk, all connects to an unexpected real criminal.
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