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2006 · Regista · GN Software
Adventure · Visual Novel · Single player · CERO C
I/O is a Japanese sci-fi mystery visual novel developed by Regista set in a near future Japan, where you play one out of four protagonists and try to uncover the mystery surrounding the killing spree in Megalopolis Tokyo.
The typical time comes from the diary. Per category, it is the median time reported by people who finished it and, without enough answers, the diary time.
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