Sakuya, aspiring to be a low-key support hero, unexpectedly vanquishes the Demon King, thrusting him into the limelight. Aimless yet driven, he enrolls in an academy for budding adventurers where he crosses paths with Fuyuna, the school's top swordsman. Witnessing Fuyuna's fiery determination to excel in inter-academy contests, Sakuya, a covert figure on the sidelines, quietly bolsters her efforts. Despite his inherent strength, Sakuya hesitates to showcase his full power, opting to stay discreet.