Kotoko is a powerful and unsettling drama that explores the fragility of mental health and the devastating consequences of trauma. The film tells the story of a young mother named Kotoko who struggles to care for her infant son while suffering from double vision, which triggers hallucinations and self-harm. After her son is taken away, Kotoko embarks on a volatile relationship with a novelist named Seitaro Tanaka, who is also haunted by his own demons. As Kotoko's mental state deteriorates, she becomes increasingly isolated and her hallucinations become more vivid and disturbing. The film's raw and unflinching portrayal of mental illness makes for a difficult but necessary watch, with a haunting atmosphere that lingers long after the credits roll.

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Some movies that have similar genres and were produced around the same time as Kotoko include The Girl Next Door, Bone Tomahawk, The Skin I Live In, Martyrs, Antichrist, Black Swan.