21-Two One- is a Japanese murder mystery visual novel developed by BasiL, it was first released as an adult PC game for Microsoft Windows on May 25, 2001. 21-Two One- was later released for the Dreamcast by PrincessSoft on December 27, 2001. The game is the second installment by BasiL, and after the completion of 21-Two One-, BasiL went on to create their third and final eroge, Cherry Petals Fall Like Teardrops, before forming a new company called Navel.
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