Hana Somei/Plot

Background
In the past, Somei was forced by her father to study continuously in order to maintain high marks, though Somei did it principally for the benefit of self-awareness. During the First Large-Scale Invasion, she saved her neighbor Katori instead of her family because Katori had the higher chance of being saved. After the invasion, she planned on joining Border and become the very best.

B-Rank Rank Battles Arc
When Wakamura and Katori erupt into an argument about preparation for the upcoming Rank Battle, she sternly reminds them that they're in the middle of work, and to do it seriously. Wakamura then accuses her of being angry, and Katori gets into an argument with him about that.