Koha-Ace GO - Imperial Capital Holy Grail Strange Story

The delusions of Keikenchi, author of the Koha-Ace series, are finally a reality!?
A new Holy Grail War begins in a parallel Imperial Capital during wartime!
The curtain draws on a struggle between new Servants like Okita Souji and Oda Nobunaga as they battle for the Holy Grail in Japan!? (Fifth Volume of Koha-Ace, following Koha-Ace XP. Adaptation of Koha-Ace EX's Imperial Capital Holy Grail Strange Story, which would eventually become the basis for Fate/Type Redline)