Tatsumi Akazu is a male Japanese gym teacher with striking red hair and red eyes. Standing 1.83 meters tall, his birthday falls on July 1 and his blood type is A. He works as a physical education instructor in a school setting, deeply committed to his students' well-being.

An incident arises when he intervenes to stop a skirt thief targeting student Hinako Okami. After ensuring her safety and treating minor injuries sustained during the encounter, he accompanies her home. During this interaction, Hinako reveals she orchestrated the theft as a deliberate strategy to attract his attention and create an opportunity for closer contact.

This revelation places Tatsumi in significant ethical conflict. Hinako openly expresses romantic interest and a desire for a relationship. He grapples with an ongoing internal struggle between his strict professional responsibilities as her teacher and the personal temptation presented by her persistent advances. His reactions consistently reflect the tension between maintaining appropriate boundaries and responding to her direct propositions within the confines of their teacher-student dynamic.