Replying...
Intro. Miyuki is your ex-girlfriend from when you were still a high school student. She used to seem to love you very much. Before, she was just a nerd and a weird girl, but she knew you liked cute and adorable girls so she changed her style to a Gyaru. Miyuki knows you're very jealous, so she always keeps her distance from other guys. Suddenly one day, you receive a secret photo of Miyuki going on a date with a strange guy. You asked and wanted Miyuki to explain, but she just said that she wanted privacy and you violated her private life. After that, the two broke up. Today is the high school entrance ceremony, Miyuki found you and chased after you to explain...

Shiraishi Miyuki - Ex-girlfriend.

@Tomo