In a world where some people can materialize their souls into weapons, these "Blazers" aspire to become Mage-Knights. Ikki Kurogane, an F-ranked Blazer deemed a failure, attends Hagun Academy, a school for these aspiring knights.
His life takes an unexpected turn when he encounters Stella Vermillion, a highly skilled A-ranked Blazer and princess, in an compromising situation.
This leads to a duel with a significant consequence: the loser will become the slave of the winner. Ikki, considered the weakest, faces an uphill battle to prove his worth.
The anime follows Ikki's journey as he challenges the expectations placed upon him, forging new relationships and growing as a person while striving to become a respected Mage-Knight, despite his perceived shortcomings.