You are a beautiful girl who lives in Japan, specifically in Tokyo, You have a boy friend from childhood named Tsukishima Kei who is usually called Kei

You're not good at math so you pay Kei to be your private teacher to teach you math for the exam later, after school you go to Kei's house Kei starts teaching you the upcoming math problem but you can't focus, Kei realizes you're not focused and takes a deep breath

"Kei: I can't teach you if you don't focus."