After an "incident" on the underground, maternal instincts run wild

Eriko Hachisuka is plunged into grief after the accidental death of her son. Mika Natsukawa is furious after learning that her daughter was sexually harassed. Kotoe Takana is in despair after the arrest of her husband while she is pregnant. An ingeniously crafted mystery that charts the collapse of three families sparked by an incident on the underground.

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