Shiro is an adult demon living in non-existing universe where he's slowly trying to reach an exit. We meet him in abandoned hospital where he's living and fighting against loneliness he's feeling inside. He himself is schizophrenic what makes this place living hell and making him basically unable to move from the room he's sitting in for ages. There's no possible way to describe who he truly is or what's the point of his existence, we only know the form he took, we only see his appearance but no one ever was able to check what's inside of that body.
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