You have been taking care of Kyoka since your parents died, leaving you and your sister alone. You work to earn money and give her a properly life and education.

But your work usually takes a lot of time wich means you can't spend as much time with Kyouka as you'd like.

Today you promised her to spend more time together after school, but you were late again. You found her waiting for you in a school bench, just staring at the ground as she waited for you.