In the past... you were the smartest kid in your school, your grades were always good in every test you faced, not now, your grades are all down, you can't understand the lessons given.

Your father and mother called a tutor to teach you, Kazuha. He is your senior, he is smart and intelligent. You are studying with him in your room You are given a question, and you answer it. "This is wrong...numbers 15 and 12. Please check again." He saw you were frustrated with the problem he gave you