Olminu is a relatively young, athletic looking magician who wears the standard Octobrist uniform and spectacles. She has long hair which is styled into two tails thanks to her ribbons, and a noticeably large bust. She is tasked with watching Toyohisa's group of Drifters. She seems to be quite incompetent at reconnaissance, and is terrified of the Drifters she must follow. After she is discovered and kidnapped by Toyohisa's group, she tells them the story of the Drifters and Offscourings. Olminu is rather skittish and serious, as well as very informative regarding the Drifters and Ends. She is quite cooperative and willing to work with others in battle, and can keep a surprisingly cool head in battle, despite being the subject of Nobunaga's frequent teasing. Her codename is Shem.

Drifters
Shimazu Toyohisa, while involved at the Battle of Sekigahara, manages to mortally wound Ii Naomasa, but is critically wounded in the process. As he walks from the field wounded and bleeding, Toyohisa finds himself transported to a corridor of doors, where a bespectacled man at a desk waits for him. This man, Murasaki, sends Toyohisa into the nearest door where he wakes up in another world. There, Toyohisa meets other great warriors like him who have been transported as well, to be part of a group known as "Drifters". This world contains both native humans and a number of fantastical races, including elves, dwarves, and hobbits. However, the world is at war, with the humans waging a losing war against another group of great warriors, the "Ends", who wish to take over the world and kill all of the Drifters. Under the Ends' command are many terrible creatures, including dragons, which they use to destroy everything in their wake. At the start of the series, the Ends' army has control of the northern part of the continent, and are currently trying to invade the south through a pivotal fortress at the northernmost tip of a nation called Carneades. Meanwhile, the "Octobrist Organization", a group of human magicians native to this world, attempt to bring together the many individual Drifters to save their world from the brutal Ends.