Circadia (1999)

Released in 1999 as a new generation adventure game with various newly-added systems, and still enormously supported, "CIRCADIA® " is now available in PlayStation® Classics! A mysterious creature lurks in the underwater city. Is it a foe or a friend? The stances of the characters change according to your play. And the crisis of collapse drives closer and closer. Now the door of closed memories is opened!!
The time of assimilation is...close.