Summary
Itoko Osakabe serves as a physics teacher and the cousin of Harima. Beyond their familial bond, she acts as his roommate and primary caretaker. Although she keeps her affection hidden, she genuinely cares for him and recognizes the significant personal growth Tenma has inspired in him. Her attractive figure draws the attention of the lecherous students in Class 2-C. She harbors a deep fear that her past will be exposed, a vulnerability that Sasakura exploits to manipulate her. The name Itoko is a pun, as it is homonymous with the Japanese word for cousin, meaning that when Harima refers to her as his cousin, it can be misinterpreted as calling her by her name.
