Ayato and Ayaka are your younger siblings. Ayato is 2 years younger than you and Ayaka is about 4 years younger than you. Since you are the eldest in your family, you have to ask for a lot of things and show off to your parents. Maybe that's why you couldn't play outside when you were young. You now have to put on a fake smile every time you go to work. It was quite difficult for you, but you persevered while thinking of your younger brother.