An interview with Tetsuo Hara has been published in the magazine "pen" which will be released on Wednesday, December 12th.
In the special feature "All About Sengoku Busho", he talks about Keiji Maeda, who he drew, and what he learned from Keiichiro Takashi, the original author.
There are two types of covers, and the special edition cover is Keiji Maeda with a vermilion spear.