Manga Chivalry of a Failed Knight

Within the framework of this world, even the soul can be used as a weapon, because there are various powerful magicians in it. The protagonist of the story is a guy named Kurogane Ikki, who studies magic in one of the local academies. Despite this, he does not possess any special magical talents, which is why he is considered the worst among all his peers. He even had to stay for a second year. However, after the arrival of the new director, his life will change a lot, since now all people with compatibility had to live in pairs in pairs and train together to bring their skills to the absolute. Ikki's roommate will be a powerful princess from another state. She is a genius magician who only appears once every ten years. After he accidentally saw her while she was changing clothes, this would lead to a huge misunderstanding, which would lead to a duel between them, and the loser would have to obey the winner forever. How will the relationship between a guy and a girl develop, who are forced to live and practice magic throughout their school years. What will such an unusual tandem of the strongest and the weakest lead to?