原哲夫
In 2008, a "Keiji" spin-off titled "Gifū Dōdō!! Naoe Kanetsugu -Maeda Keiji Tsuki-gatari-", written by Tetsuo Hara and Nobuhiko Horie and illustrated by Yuji Takemura, began serialization in Shinchosha's "Weekly Comic Bunch" on November 7. The series was stopped on August 27, 2010, after "Weekly Comic Bunch" ended its publication. Nine volumes were published.