The series will take place between April 19 and 21 at Kyocera Dome Osaka. The teams will wear retro home uniforms during the series -- Orix will wear Kintetsu uniforms worn between 1978 and 1996 while Softbank will wear Nankai uniforms worn between 1984 and 1988.
Special guests will also be in attendance: Kazunori Yamamoto on April 19, Hiromitsu Kadota on April 20, and Masato Yoshii on April 21.
Additional information about the series can be found at the official team site and official series web site.
Naniwa Championship 2013: Osaka Classic Buffaloes vs Hawks (original post)