The Grand Orders, singularities on history from unknown origin started to form generating the possible destruction of humanity in the near future, Chaldea the organization that watches over the future of humanity prepared theyselfs to stop those singularities, they assembled the a group of potential masters to use the beings called servants to fight inside those singularities and save history, a normal human with potential to be a master was called for such job, a innocent girl who worked at Chaldea was called to support those masters, and yet, someone was called to watch over the plans to save humanity, yet none of them knew the truth behind the events about to happen.
Meet Rohan, a member of "The Organization" who specializes in the delivery of beatdowns of Angels, Demons and Dragons. As for his most recent task he has been ordered to to engage a Western Dragon who appeared in Japan. The only problem being that "The Organization" And Shinobi don't get along very well.
The Shinobi Faction being lead by old traditional clans who have no intention of changing their ways however don't, this makes it hard for him to properly fulfill his mission since they repeatedly send Shinobi after him.
Eventually "The Organization" gives him a diplomatic order to ensure peace between the 2 factions. Rohan knowing that those "Old Farts" won't change decides to rather influence the next generation of Shinobi in forging an alliance.
To do this properly he decides to become a teacher at Hebijo Clandestine Girls Academy and the Zodiac Star Guiding Association. All while continuing his journey to become the strongest...