jokou_no_seisen
女皇の聖戦 (Jokou no Seisen, lit. "Empress's Sacred War")
A series of alternate history war novels written by Yoshida Chikashi, illustrated by Washio Naohiro and published by Asahi Shinbun Publications. It's a sequel to the same author's Jokou no Teikoku, published by KK Bestsellers.