Maria Imai, a bespectacled, dark-haired student and founding member of the cosplay club, embodies the traditional role of a shrine maiden (miko) within the group. Her defining trait is her fervent protectiveness toward her younger sister, Athena, who, though too young to enroll at the academy, actively joins club events. Maria vigilantly intervenes whenever Jenny, a foreign exchange student with a Lolita Complex, directs unwelcome attention toward Athena—a recurring clash that often leaves Maria overwhelmed to the point of fainting.

These confrontations underscore her guardian-like demeanor, though Athena occasionally misreads Maria’s defensive actions as romantic jealousy, sparking comedic tension. Despite her earnest, reserved nature contrasting sharply with the club’s lively chaos, Maria dedicates herself to their collective efforts, contributing to tasks like sewing and costume coordination during training camps and competitions. While her technical skills are portrayed as competent rather than extraordinary, her steadfast presence anchors the group’s dynamic, prioritizing Athena’s safety while navigating the club’s eccentricities.