It is a Tendou Satori x Reader fanfiction. I do not own Haikyuu!! or any of it's characters.

As Ushijima's younger sister you've been exposed to volleyball a lot in your life . Having a brother like him everything is serious and intense he expects you to be perfect in every way. And you listen. That is until you meet satori Tendou.

What if one day you received a letter from your future self? The letter revealed all of the regrets you are going to make in your third year of school...and how to stop them from happening. There is one goal through all of it, don't loose Bokuto Koutarou. [Inspired by the manga/anime "Orange".]