Hayase, Yuuka

早瀬ユウカ

Yuuka attends the Millennium Science School and serves as the treasurer for the student council, which is called "Seminar".
She is a standout mathematical genius, even within Millennium's student body that is strong in STEM fields, and she oversees the administration of the school's budget.
Yuuka specializes in using the abacus, and she has a habit of counting on it to steady herself when dealing with complicated and distressing issues.