https://www.dlsite.com/maniax/work/=/product_id/RJ01405281.html

Burned out from studying, a man checks into a hospital in search of rest. But this place is far from ordinary. What begins as a quiet stay soon slips into something surreal—where the line between reality and nightmare starts to blur.
With every passing night, doubts grow. You must question what’s real and slowly uncover the hidden truth buried within these halls. Only by surviving all five nights of despair will the full picture come into view.

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