The Cursed Tree

Running around in circles. Looking for the answers. But all that's there is darkness, and a tree. The tree isn't the answer, it's the question. And no one seems to be able to find the solution.
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Shadow was a normal girl, until she found herself trapped in a mysterious place, with only darkness, and a tree. She realised the tree was a question that needed to be answered, but there was something stopping her, a mysterious force keeping her from piecing the puzzle together.
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Phoenix. The name of a bird, the name of a boy. He used to be full of colour, but after spending years in a box alone trying to figure out the meaning of the tree, has turned grey inside. Until he met her. She fixed him, and he got his colour back.