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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.
I/O was released on January 26, 2006.
I/O is available on PlayStation 2.
No — I/O is a single-player game.
I/O was developed by Regista and published by GN Software.
I/O is rated C by CERO.