The story follows a young girl named Riko, who had just received her acceptance letter to Oppai Succubus Academy. Riko was ecstatic, as she had always been fascinated by the art of seduction and the power it held. She packed her bags, bid farewell to her family, and descended into the underworld to begin her journey.
In a world where demons and supernatural creatures existed, there was a legendary academy hidden in the depths of the underworld. Oppai Succubus Academy, a prestigious institution, was renowned for producing the most alluring and powerful succubi in the realm. The academy's student body consisted of young succubi-in-training, each with a unique ability to enthrall and seduce.
However, not all was well at Oppai Succubus Academy. A dark force, known only as the "Shadow," threatened to disrupt the balance of power in the underworld. The Shadow sought to exploit the succubi's abilities for its own malicious purposes.
The academy was divided into five houses, each representing a different aspect of a succubus's powers: Charm, Seduction, Illusion, Manipulation, and Temptation. Riko was sorted into the Seduction house, where she would learn the art of enticing and beguiling others.