Frequent collaborators

• Naoto Takenaka 2 titles
• Hiroyuki Watanabe 2 titles
• Kazuki Kitamura 2 titles
• Kenji Haga 2 titles
• Hitoshi Ozawa 2 titles
• Hiroyuki Konishi 2 titles
• Hideo Nakano 2 titles
• Shinji Yamashita 2 titles
• Tamotsu Ishibashi 2 titles