One night, contract killers Safo and Erina celebrate their latest work when they are surprised by an unusual request: a black envelope with just the signature 'V'.
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According to Sigmund Freud: “Unexpressed emotions will never die. They are buried alive and will come forth later in uglier ways”. “Umbral” materialises the moral dilemma of whether there is a cause and effect link between trauma and criminal behaviour.
