中裕司
As part of Sega's "support program for independent game creators", Yuji Naka left Sega's Sonic Team studio to start his own studio, joined by ten Sonic Team members. It had a starting capital of 10 million yen, 10% of which came from Sega in exchange for the right of first refusal for publishing Prope games. Prope was founded on May 23, 2006 and it began operations on June 1, 2006.