Koha-Ace Ex summary:
A Holy Grail War has broken out in Koha-Ace! After managing to avoid getting axed again and again, some miracle has allowed for a third volume of Koha-Ace! The mysterious new Servant designed by Takashi Takeuchi, Sakura Saber, is a storm of romance who will play an active role! We'll show you the real power of Koha-Ace. (Third Volume of Koha-Ace, following Koha-Ace+)