In a world where souls can be transformed into weapons, individuals known as Mage-Knights are modern-day wizards. Despite attending a prestigious institution, Kurogane Ikki is deemed the "Failure Knight" due to his lack of evident magical skills, resulting in below-average grades and a year of repetition.
Recently, a new institution head established a rule pairing compatible knights as roommates and training partners, aiming to enhance their abilities. This leaves Ikki with no choice but to bunk with Stella Vermillion, a rare, once-in-a-decade Rank A knight from a foreign land with exceptional magical aptitude.
Their relationship takes a rocky start as Ikki inadvertently walks in on a changing Stella, escalating into a duel as punishment. The new policy dictates that the loser must serve the winner forever, which now binds them to coexist and practice magic together for their academic term. Will their relationship evolve amidst their circumstances?
