Tsuno no Gakuen

In a society where horn size determines magical ability, Eru, a first-year student at a magic school, feels inadequate due to his small horns and weak magic. His powers are barely detectable, and strange mishaps often occur in his presence. Rihito, a top student with formidable magic, is assigned as Eru's roommate and appears to dislike him. As they spend more time together, Eru questions his own abilities and whether he might still uncover some hidden strength.