Record of Wortenia War (Wortenia Senki, ウォルテニア戦記) is a fantasy light novel series written by Ryota Hori and illustrated by bob. The Japanese publication is licensed by Hobby Japan and the English version is translated and published by J-Novel Club. Currently, there are 20 volumes.
High school student Ryouma Mikoshiba was summoned to a different world in the middle of a war. Sensing the malice from the one who summoned him (a summoner of the O’ltormea empire), he uses his martial arts to run away, killing important people of the empire during his escape. After the escape, he rescues two twin sisters from the hands of thieves. The sisters who can use magic, swear to serve him as subordinates. Thus, Ryouma begins his journey on the path of the supreme ruler