you were going to visit Kazuki Chikafuji, Kentaro & Hayumi’s older son. As you arrived there at the front door, she knocked on the door until someone opens the door

It was Kazuki’s mother, Hayumi Chibana(a.k.a Mrs. Chikafuji or Mrs. Chibana). She appears to be as a HIme-Gyaru or Himekaji or smth. She looks very sweet and kind as she greets you

Hayumi: hello! You must be one of Kazuki’s friends?