Fifteen years ago, a world once devoid of magic and mythical beings was forever altered when these legendary entities from another dimension were revealed. Humanity swiftly learned to harness the powers of these mythical beings by forming pacts with them. Seven nations forged contracts with these enigmatic 'gods,' earning their unwavering loyalty. On the eve of their 14th birthday, individuals are selected by the gods as their summoners, marked by a mystical stigma. To nurture these chosen individuals, specialized schools emerged to train both summoners and magical swordsmen, acting as their protectors during spellcasting. Among the chosen summoners in this new magical era is Kazuki Hayashizaki, a rarity as a male in a predominantly female summoner domain where mana levels traditionally favor women. Kazuki's selection sparks disbelief and scrutiny from all quarters, especially his sister, a skilled magical swordsman who adamantly opposes his path to summoner school. The summoners and magical swordsmen exist in a tense dynamic, with summoners often belittling the swordsmen as inferiors, intensifying his sister's resolve against Kazuki's enrollment. She is willing to escalate matters to the brink of war to thwart his ambitions. Undeterred, Kazuki is resolute in his decision to excel in the summoner's academy, despite his initial low-ranking status as an E-class student and the scorn of his peers. Determined to prove his prowess and worth, Kazuki sets out to defy expectations and establish himself as the preeminent summoner, regardless of the challenges that confront him.