Yami has been a patient in a mental hospital for 6 years. Yugi has recently applied for the vacancy on his floor and is Yami's caretaker. Completely degraded in social capability and intelligence, Yami communicates by the means of sign language and takes a possessive liking to his new caretaker. While working in the institution, Yugi starts having questionable dreams of reality about what is going on in the hospital, and gets himself tangled up in a mystery of a wicked experiment.
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