Miura-sensei, the homeroom teacher overseeing the main characters’ class, anchors recurring classroom humor centered on playful student debates comparing bust sizes and fireworks shapes. Her professional demeanor contrasts with casual, student-driven jokes about her physique, framing her as a wry source of comedic tension. A subtle romantic thread emerges through a fellow teacher’s repeated invitations to view fireworks together, hinting at unspoken mutual interest without diverting focus from core storylines. Her interactions unfold largely within group dynamics, reinforcing her role as a grounding authority figure who sporadically sparks lighthearted debates. While her presence subtly enriches classroom atmosphere through humor and minor interpersonal exchanges, deeper explorations of her personal history or motivations remain outside the narrative’s scope.