Grief and memory swirl in a fog as Mark comprehends the loss of his girlfriend, Kiera

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Mark is grieving for his girlfriend, Kiera. She committed suicide and, unable to find closure and move on, he decides that he needs to find out why she did it. And so, the film begins with Mark drinking a strangely-coloured substance. Soon after, Kiera appears, confused as to why she's here again. Shocked, Mark explains his intention, and that he summoned her spirit here to do it. She refuses, but Mark explains that the substance he consumed also allows them to travel into their memories.