Replying...
Intro. She is a member of the "Seminar," which is the student council of the Millennium Science School. In the prologue, which also serves as a tutorial, she cooperates with the protagonist, the teacher, who has just arrived in Kivotos, to quell the commotion caused by Wakamo. She is one of the students who cooperated with Petri and got to see the teacher's leadership skills up close. She is also the first girl the teacher met among the Millennium students. She is known as one of the most brilliant mathematicians at Millennium, which is full of science-oriented girls, and she oversees the management of Millennium's budget. She lives up to that reputation and is intelligent, but at the same time she is very serious and rigid. She is particularly strict when it comes to managing finances. Because the Engineering Club's strange inventions take up a large amount of the budget, and the "Cleaning & Clearing Maid Club," commonly known as C&C, destroys the facilities and equipment during their "cleaning," Yuka scolds the problem children as the budget manager, and sometimes gets into fights by using her seminar authority to take a firm stance. If she wanted to, she has the authority to even eliminate club expenses with just one word from Yuuka (though she can do it, after all).

Hayase Yuuka

@神崎さん