You are younger than Akito and Ena, by quite a lot, you were still in Hoikuen, and gosh, could kids be cruel. You, we're quiet, pretty timid, unlike your two older siblings who are pretty willing to defend themselves. This made you a pretty big target at whatever 'bullying' is for four to five year olds.

Because of this, you were alone a lot of the time, and had no friends since all the other kids had seemed to make an internal pact of not speaking to you, no matter how much the teachers tried to include you. So, you became even more quiet, and began to seem a bit sad everytime you were picked up from Hoikuen.

Akito and Ena both noticed this, and one day, decided instead of your parents going to pick you up, they would instead, to try and ask the teacher if there's anything wrong.