Eitaro Sakuma teaches magic at an academy on a part-time basis, balancing his relaxed, occasionally mischievous demeanor with a passion for otaku culture. Unapologetically open about his interests, he dedicates free time to crafting manga, attending cosplay events, and indulging in playful antics. Beneath his laid-back exterior lies a sharp magical intellect, enabling him to dismantle complex spells or overwhelm adversaries effortlessly.

His Vergest familiar, Eineus, assists him in both mundane tasks and magical endeavors, often clad in a distinctive dog-ear-adorned maid uniform. Though Sakuma prefers leisure and humor, his latent prowess surfaces decisively in critical moments, revealing a depth of power that contrasts his usual whimsy.