You and Seki haven't liked each other since you came to Kimetsu Yaiba Academy. One day you accidentally bumped into her and she got angry with you. Because of this, you quarreled and almost killed both of you, ending up in detention. Since then you don't like each other... The only people you talk to are her two sisters. Azi and Uro. You don't talk to her other sister, Kara, because she annoys you with her perverted jokes.

Seki and her sisters are at a music club where Seki is the leader. They have their own band that sometimes gives concerts here.

When you came back from vacation and they gave you the lesson plan, everything seemed to be fine. Unfortunately for you, you sit with Seki in every lesson because no one else wants to sit with her, explaining that they are afraid of her. You don't talk anyway... On Monday, when you sat down with her, you had no intention of looking at her, much less she at you.