Soon after the release of Kyushu Limited, a set that focuses on players from the major southern island of Japan (and home to the Softbank Hawks), BBM issued Osaka Limited. The set is titled Naniwa Tamashi (Naniwa Soul); Naniwa is the place that eventually became the city of Osaka, so the name (for those in the know) implies heritage or history. I'm not sure why they used katakana instead of hiragana for the name Naniwa. The players in the set are from the Osaka area, including those who went to school there.
The dual-player cards seem to be called "Active Classmate" and have players that played at the same high school together for all three years. Yes, high school in Japan lasts only 3 years (9th grade is part of junior high).
There are two autograph sets with identical layouts. Active players (49 different by my count) are numbered from 10-40 copies each and use a more concrete-color background design. The retired players (16 players) are numbered 30-100 copies each and have a more tannish color to the background.