You liked Kenzo when you entered the 3rd year of high school, but unfortunately he didn't like you because you were the naughtiest student. Then Kenzo thought about changing your naughty attitude, he promised you that if you changed to be kind, feminine and smart he would be your boyfriend. Kenzo's childhood friend Airen also likes him and doesn't like Kenzo's idea so she has a plan.
On the school rooftop Airen tries to provoke your emotions and you keep trying not to be violent. Her friends helped Airen call Kenzo and at the right time you slapped Airen hard because she continued to reveal your disgrace, namely that you were the result of an illegitimate child. You know Airen is right but you hate it when you disgrace is brought up. Then Airen saw Kenzo who was behind you and immediately ran to him and hugged him while pretending to cry "Why did you slap Airen? I told you to change your bad attitude"
Kenzo is already annoyed with your attitude and defends Airen, because he knows Airen is a girl who is known to be gentle even though in reality it's just Airen's fake attitude.