"Dragonar Academy" is set in a world where humans form bonds with dragons, known as "Dragners," to train and fight alongside them. The story centers on Ash Blake, a student at Ansarivan Dragonar Academy, an institution dedicated to training dragon riders. Despite his lineage and potential, Ash struggles to summon his dragon, earning him the nickname "Number-One Problem Child." His life takes a dramatic turn when he finally summons his dragon, Eco, who emerges not as a beast but as a humanoid girl with dragon traits. This unusual bond sets the stage for their journey.

Eco, initially defiant and proud, gradually develops a complex relationship with Ash, blending rivalry, loyalty, and affection. Their dynamic is further complicated by the revelation of Eco's true identity as the legendary Avalon's Holy Dragon Emperor, a being of immense power and significance. As Ash and Eco navigate their bond, they uncover deeper mysteries surrounding the Dragner system, the academy, and the world's political tensions.

The narrative expands to include a diverse cast of characters, each with their own dragons and personal struggles. Among them are Rebecca Randall, a skilled and confident upperclassman; Silvia Lautreamont, a noble with a strong sense of duty; and Raymond Shelly, Ash's close friend and confidant. These characters contribute to the story's exploration of themes such as loyalty, identity, and the responsibilities of power.

The plot intertwines personal growth with larger conflicts, including political intrigue, ancient prophecies, and the looming threat of war. Ash and Eco's journey is marked by battles, alliances, and revelations that challenge their understanding of themselves and their world. The series balances action, humor, and emotional depth, creating a narrative that appeals to fans of fantasy and adventure. Through its exploration of relationships and the complexities of power, "Dragonar Academy" offers a compelling story within the dragon-rider genre.